Features:

  • Premium 6 button multi-color optical right-handed ergonomic gaming mouse. The unique award winning shape and has been developed to be used by right-handed gamers and to equally support palm, claw and fingertip grip style. The mouse has a dedicated pinky- and ring-finger support-groove which makes it most comfortable to hold and lift even for low sensitivity FPS play styles.
  • The mouse has a dedicated pinky- and ring-finger support-groove which makes it most comfortable to hold and lift in RTS Game like LOL, DoTA further it suits low sensitivity FPS play styles in game like CS:GO, Overwatch, Battlefield, Quake.
  • Get a Fresh Desk and make the Computer Desktop a style statement with Castor’s in beautiful color. Whether you're in the mood for ice cream blue, frosting pink, french fries yellow or shark fin grey in monochrome colorizations including case & cable
  • The Castor uses a PMW-3310 gaming grade optical sensor which has no positive or negative hardware acceleration set at native 5000 DPI.
  • Whether you are gaming at high or low sensitivity, the Castor will always respond onscreen with razor sharp accuracy and the natural fluidity only possible with our phenomenal MAC and PC software.
It feels great in the hand and the build quality is great

I have had this mouse for almost two years now. I play a lot of CSGO and some RTS games. It has held up well. It feels great in the hand and the build quality is great. The feet are nice and wide and have held up well. The software you can download is really helpful. You can set liftoff distance and it has an option to help calibrate your mouse for your mousepad. Also all of the settings you change such as DPI and liftoff can be saved to the mouse so you don't need to worry about having the profile somewhere on your computer or make sure you run their software first. Just run it when you want to make a change and the mouse is good to go. I have used a lot of mice for gaming and I think this mouse is one of the good ones. It was an upgrade from Logitech MX 518 which still works and is also great mouse. I upgraded because I wanted to try something new.

Perfection Gaming

The Castor is a comfortable mouse with a great Optical Sensor. Coming from the Mionix Naos 8200 I can see a noticeable difference in smoother more precise movement. This mouse has zero acceleration which makes for a great gaming session. It's a comfortable feeling when you grip the mouse, it feels buttery smooth. I had no problem palm or claw gripping the mouse, they both felt comfortable. I love the the textured thumb rest on the left. Now here's a neat trick to get five DPI levels out of this mouse instead of the standard three level DPI and know exactly what DPI level your on by assigning specific colors for each DPI level. The software allows you to store up to five profiles to the mouse. What I did is start with my normal DPI setting when I am on the desktop. I set profile1 sensors to all one level, for me 800 is the sweet spot for desktop, I then go to mouse settings tab and change button 6 to "Profile switch roll", from there I go to the color tab and assign a specific color for Profile1 and apply. Do this for the rest of the Profiles, assigning specific DPI levels and colors, make sure for all Profiles you assign button 6 to "Profile switch roll" otherwise you're going to be wondering why its not working. Now go and enjoy your beautiful new mouse!

Very good mouse for gaming and casual use

Very good mouse for gaming and casual use. A nice balance of both. The wire is mesh-threaded which is very nice. The lights on the mouse are an added bonus (and can be turned off if you dont want them on). The only issue I think it has is not being able to change profiles outside of the software. You can make up to 5 profiles on the software with 3 DPI settings on each profile. There is a button on the mouse to toggle through your 3 DPI's, but no button on the mouse to change profiles (unless you map a button on the mouse to scroll though profiles but youd have to dedicate that button to do that on each profile, and you'd miss out on the original function of that button of course). Its not too overbearing to load up the software anytime I want to swap between my 3 profiles (One for casual use, one for Overwatch, and another for no light. Overall recommend if you're already interested in getting it!

Whoever said "money can't buy happiness" was an awful liar.

Okay, let's get this out of the way: I have a bit of a mouse problem. Not the kind you need a cat for; rather, I purchased five mice this year. That's one mouse more than I have limbs that can use them (I'm very talented, not an octopus). With that said, the Mionix Castor makes me happy every time I touch it. To compare, my Logitech G9x will warm the cockles every once in awhile when I'm FPSing and I pull off some slick magic with a whipped headshot on a huge DPI setting, or when I remember to toggle the smooth scroll wheel on the bottom for scrolling through pages at ludicrous speed. But that's chump change in comparison. If the G9x is a finely-tuned weapon of virtual war, the Mionix Castor is total nuclear disarmament. It holds your hand. Now I don't mean it's a bear of a thing that you'll haul around by its rough matte surface - and to be honest, that's what I feared it'd be. Nope! You're holding hands with Mr. Castor, who just really wants to know what's bothering you at work and offer some sage advice that'll turn the whole world right. It's something about the plastic and its coating - the G9x has this rubberized matte that doesn't rub your hand raw, but it sure catches any dead skin that might've been there and hides it until you manage to accidentally scrape it and there's that white streak and UGH. (Still not a bad mouse, for the record.) The Mionix feels... silky? It's like microfiber had a really nice shave, and since it's sculpted to let your hand just fall into it, it catches the warmth and radiates it back JUST ENOUGH so that it feels indescribable. But that's just the surface. We have to go deeper! The Castor claims to have a zero-tracking sensor. Despite buying anything remotely resembling a mouse that passes in front of me, I can't speak to that mechanically. But from a user standpoint, it might have something to do with how intuitive the movement is - there's no learning curve to speak of, and movements come out precisely as you make them and without compromise. And since the software that comes with it allows an absurd amount of customization (want different levels of DPI for vertical and horizontal movement for some reason? knock yourself out!) it's easy to tweak to your liking. The switches on this thing, too. MAN. Clicking is crisp and offers some real tactile feedback, but the actuation window (where the actual "click" happens and the mouse registers your input) is thin enough to reliably double-click at lightning speed without missing a single press. And it's not like some mice that will only click reliably and comfortably if your fingers are right on the switch - they just work! Really, the best feedback I can give is that this mouse is subtle. It shows a lot of design knowhow from a usability standpoint, and an appreciation for its breadth of potential use. The sculpted finger rest on the right side? Uninvasive if you're not using it, but that slight little ridge is heaven if you're palming the Castor. Surprising for me, since I'm usually more prone to claw or rest my pinky and thumb on the mousepad for precision movements (which you can still do, by the way). And you may have noticed in the photos: it's Not Ugly. The amount of control you have over the lights is actually pretty funny - pink blinking lights? Sure! Two different colors for your scroll wheel and the logo? Why not? Shove your favorite color code in there and get to work. I have mine set to slowly pulse through a gradient on just the mouse wheel, and it's gradual enough that it's actually really pleasant. And I'm someone who generally hates LEDs on input devices. So, worth it? You bet your firstborn it is. Seriously, if you're in the market for a mouse and this is within your budget, give it a shot. My only criticism is that it'd be nice if you could set it to ratcheting or smooth scroll, but I think that's just coming from the G9x (and as I mentioned previously, I forget about it often).

The amount of fine tune settings really makes this mouse a hero!

I am a gamer but I didn't need a mouse that had a ton of buttons all over it that I will never use. This is the first gaming mouse that I have bought and I'm really enjoying the control and turning radius! I'm still figuring out all the settings but am pleased at my performance in my multiplayer games. I no longer knock things off my desk trying to turn around to shoot enemies in game. I also use it for my work and really like the rubber scroll wheel and thumb placement. I'm still not using the programmable buttons, but maybe one day! I bought this not only because it had the features I wanted but based on the other reviews written about it here on Amazon.

Finally found my mouse.

I've been looking for something to replace the g9x as it was the best mouse by far for me. The g502 was too heavy, g303 too small, m65 too awkward/heavy, deathadder too big, the rival 500 was great but it was slightly too big and too heavy. I've tried so many and this mouse is the one. Even better than g9x, so happy to finally end my search for a great mouse. I have small to medium hands and use in between fingertip and palm grip. I'd definitely recommend this mouse!

My favorite mouse so far, from something of a mouse addict.

I'm not sure where to begin with this: I'm a little mouse addicted, I currently have (on my mouse pad) a Razer Basilisk, Logitech g502, Corsair m65, SteelSeries Rival 700, Mionix Naos 7000 and Mionix Castor. I previously have owned a Logitech g402 and Mad Catz Cyborg Rat 7. So with that said as a qualifier, I wasn't even aware of Mionix up until about a month ago. I decided to try the Castor first (and I actually just received the Naos 7000 a couple days ago, so I'm still working through that one) but immediately the Castor felt quite good albeit a bit odd for the first hour or so. It's a bit smaller than I standardly would use. I have pretty wide hands and usually mice of a similar footprint don't suit me very well. I knew it was going to be a bit polarizing going in, given the ergonomic shape. -Looks: It's not very tacticool, where many gaming mice are very over the top. This is a very much less is more design, almost like the ethos of modernism. I quite appreciate it, it's flat black and the LEDs aren't overly bright. Some of the other mice I have are VERY bright which can cause some issues with certain colors (namely, purple, which if too bright of an LED will appear more pink than purple). -Feel: a) I think first and foremost Mionix has absolutely blown the textures of their mice out of the park. It's a very soft/smooth, almost rubbery feeling texture on the 'plastic' parts, with actual rubber on the thumb rest. b) The shape on its own will be something you'll either love or hate. I feel like it's a lot more versatile than the initial impression might incline you to believe though. You can easily claw / fingertip grip this mouse, though for me palming can be a bit difficult, which is just as well because I don't really use a palm grip ever. Smaller hands (than my 11.5cm wide hands) could probably palm it also. c) Buttons themselves are tactile without being overly harsh. Perhaps a touch softer than the omron switches that are very popular right now. d) The mouse wheel isn't anywhere near a free spin and isn't very ratchety at all, rather about a rubbery wheel which you can feel defined bumps in, however it isn't overly ratcheted. I know everyone has their preferences here, so it may or may not suit everyone. It's worth noting that the mouse wheel is fairly recessed too. -Performance: Between all of the mice I have, I feel that this is probably one of the 'lesser' sensors, or more dated ones. Don't be fooled though, this sensor is incredibly accurate. In fact, I don't really see a perceivable difference in tracking between this and the g502, rival 700 or basilisk which are all very modern 12/16k dpi sensors. In fact, I find the comfort of this mouse (for me) enhances my aim quite a bit in games beyond what I was noticing with the others. It's also worth noting that the Castor is quite a light mouse, coming in about 5g under the 100g standard of FPS mice. This is currently my favorite mouse of the bunch, along with the Corsair m65, though this might be odd due to their drastically different shapes (and weights). It's quite different from the others and different from just about any mouse I've tried. The software can be a bit of a pain to get setup (definitely not their strong suit) but once you've saved your profile, you don't even need to use it ever again. My favorite discovery was how the ergonomic bumps on the right hand side of it can be used in claw position as a more horizontal nub to hold to while in claw grip, it's very natural changing between fingertip and claw with this and works amazingly well.

Best Frickin Mouse Ever!

I read all of the glowing reviews about this mouse on the net about how it is the most magical, comfortable mouse ever so I had to give it shot, especially when it was listed as a Prime Day lightning deal. This mouse is covered with the soft touch rubber that I love, which makes it smooth and somewhat grippy at the same time. The texturing on the sides is a great touch and not too aggressive, which makes it easy to lift off. There are slight finger grooves on the right of the mouse for your ring and pinky fingers that are great if your hand size fits. The buttons are tactile and responsive, no complaints there. The sensor is spot on and I did not detect any acceleration or jittering when using the mouse. Ergonomically, the mouse is fantastic for people with mediumish hands. I wear a medium sized glove but I can see this mouse fitting people with small to large hands fairly well. Those of you with monster mitts, this mouse may be too small for you unless you claw grip. I use a hybrid claw grip and this mouse is perfect for it. It has a pretty versatile shape so you could easily use a palm grip as will if you have medium to small hands. My only complaint really is with the software, which I feel is a bit unpolished and cluttered, making it not intuitive to use. Also. the scroll wheel is average at best, the tactile response is kind of mushy but that isn't really important to me. Overall, I was highly impressed with this mouse and recommend it to anyone looking for a comfortable, do-it-all mouse.

Great Gaming Mouse. Then it broke. Had a problem with RMA process..... then Mionix made it all right.

Pros: Put it this way, I never thought there'd be a mouse that could replace the snappy responsiveness and comfort of my Razer DeathAdder and Zowie EC2-A till I got this mouse. It feels great and it just feels right in your hand. A very light mouse, but not too light, just right. Combined with a decent cloth gaming mouse pad, this mouse is awesome. It also has on-board memory, so you won't have to keep booting up the software just to get your settings memorized (that was one of the ONLY drawbacks I had with the Razer DeathAdder). The mouse buttons have quite a nice feel to them (oh that Omron switch goodness, I tell ya!). Minor Cons: If you're a palm gripper, this mouse might not be for you. It caters to my hybrid clawgrip style quite well. But if you have huge hands, this probably isn't for you. Also, a light mouse might not be to your liking. I'm not a fan of heavy mice and this mouse has no weight management options. You either get used to the weight or you don't with this mouse. The thumb padding is great, BUT, it's a lint magnet. It's no different than the lint magnet grips of the DeathAdder, but it's a minor chore. The slope of the thumb grip might take a little getting used to, but after a while, this mouse does start to cater to your hand like a comfortable glove. UPDATE - 02/09/2016: So, I did notice the left mouse button was a lot stiffer than the right mouse button. At first, I thought that was by design. Then, the tactile 'bump' became less and less apparent to the point where the left mouse button was not working anymore. I can't believe I've owned this mouse for less than 2 months and I'm already using the insurance that I paid for this thing to send me a replacement. UPDATE - 2/17/2016: Mionix returned my messages regarding the defective Castor I had. They said that they'd be more than happy to replace my mouse. But the RMA process was horrible! They wanted the following: a) Provide a VIDEO regarding the issue b) Ship the defective product to SWEDEN. You know how much it costs to send a 1lb box to Sweden? Approx. $115+ USD! I was not happy with this proposition as a customer at all, especially when I was trying to see if they honored their warranty policy. UPDATE - 5/05/2016: So why did I change my rating back from 1 star to 5 stars? The mouse is fantastic. It just so happened that mine was defective. I respect companies like this that reach out to you to try to make things right. This is rare. A gentleman from Mionix reached out to me to (goes by the name of Christoffer) to see what they can do to make the RMA process for U.S. customers easier. Initially, I was told that I had to ship the defective product to Sweden. Shipping a 1lb box to Sweden isn't exactly cheap. So my initial experience involved Amazon refunding me my money while I ended up with defective Castor (the LMB is now completely unresponsive). Thanks to Mionix and Christoffer, amends were made and the option for U.S. customers to exercise the warranty, return or RMA process has improved drastically (you can now ship the product to a U.S. location!). The final resolution involved fantastic customer service (after my initial experience of course), a change in the return process for all U.S. customers who buy Mionix product and most importantly, they replaced my defective Castor with a fully functional and brand spanking new Castor. This company rocks and I hope computer accessory companies like Mionix keep up the great work. Thanks Amazon and thanks Mionix!

Great Quality Mouse!

I love this mouse already. I've only been using it about a week and the only gripe I have with it is that it's a fingerprint magnet.. but it's worth it for the soft rubberized coating. The thumb rest has dimples that help grip the mouse and also includes slight ring and pinky finger rests. The scroll wheel is very satisfying to use and the DPI settings are perfect right out of the box. The braided cable is a huge plus over standard cords and is long but not too long if that makes sense. The color features are just brilliant.. not only are the colors vibrant and has 16.8 million color options but the software to change it is simple, easy to use and I just love the flickering effect while it changes to your preference. It's just a nice touch that made me fall for this product even more. The software settings overall was just done very well with everything you could think of for a mouse included, even a surface detector to help optimize your experience depending on the surface you're using. It's a great mouse and I'd recommend it to anyone! Here is the review I watched before purchasing by Hardware Canucks, hope it helps: https://www.youtube.com/watch?v=Sc8k131nb3Q

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