Feels good in the hand, the scroll wheel is OVER sensitive.
926932
I love the shape, color, texture, good amount of buttons and customizability of this mouse.

The scroll wheel, though comes with a button to switch between 'stepped scroll' and 'smooth scroll' modes, both of those states, after tweaking the scroll speed in the control panels, I still find it a bit less smooth of an experience from my previous super basic M310 after a few weeks of usage.

I might need more time to get used to it. Otherwise, it's a great value.
2862456
** Updated 1/1/17 Review **
I've had this mouse for about eight months now, and the scroll wheel has already taken a hit. When I scroll up or down, it will sometimes skip a scroll, or scroll in the opposite direction. I've reached out to Mionix about this and they are happy to exchange the mouse for a new one, provided I cover the shipping cost to them. I'll send it out later, before the warranty expires, but since this is my only mouse at the moment I'm a bit hesitant. Furthermore, the sensor seems to be lagging behind as well. While I could probably blame my mouse pad for this, it may be more likely that two things are going wrong at once, but who knows. It probably is my pad, as the skipping with the sensor only seems to happen in certain areas. Either way, a mouse that lacks durability and longevity is not one that I want to use.

** Original Review **
This mouse is great for light gaming. That is, if you're into macros and large MMOs, this mouse won't be for you. While all six buttons are indeed programmable, I can't think of a time where I'd want to rebind right or left clicks. Maybe I'd reprogram the DPI switch (as I don't switch DPI basically ever), and maybe the scroll click, but it's more likely that you'll only be rebinding the two thumb buttons. It is, however, a really nice mouse to hold. It seems sculpted for the right hand, and although I have rather big hands, I can fit it nicely. The materials are very pleasant to hold, and the sleek matte black finish looks cool. I wish it had more spots for LED lighting because the colors it can reach are quite accurate.

The software is a nifty tool to program it further if you please. You can adjust liftoff distance, the LED colors, macros, sensitivity, DPI, and more. They seem to have updated the software, so I don't see any typos or such. Is it worth the $70 price tag in comparison to other mice of its class? I can't say for sure. What it lacks in multi-function, I'd say it makes up for in other ways, such as its comfort, design, and speed. But I can't say for sure, because I haven't owned other nice gaming mice.

Overall, I am pleased with this mouse. It has a sturdy build quality, and I'm a huge fan of the matte black. It also doesn't seem to leave any residue after I take my hands off of it compared to other mice. The clicks are clicky and I sure hope it holds up. The nylon threaded cable and gold plated USB plug are an additional plus.
2697998
This is a pretty good product. Despite my large hands the buttons on the side aren't too small to press without accidentally pressing others. It's also comfortable, there is a resting spot on the side for the ring finger which helps with soreness. I only rated 4 stars for two minor things, firstly the light on the scroll wheel can't be programmed to match the light you set for the logo, it only comes in 5 colors, one for each profile setting. It would have been nice to be able to set the scroll wheel color as well for consistency. Only other minor thing is occasional spasm-glitches where the cursor briefly goes nuts. This latter issue is very rare, however, and doesn't prove to be a consistent issue. Overall I recommend this product for people who want a decent, relatively cheap gaming mouse with a lot of buttons, and I would whole-heartedly reccommend it to fellow big-handers.
4264643
I started using this mouse not because of carpal tunnel syndrome, but chronic tennis elbow.  My doctor first suggested a wrist brace to try to limit the effects of work (programming) on elbow pain, but that got old in a hurry, so I decided to try a vertical mouse and adjustable keyboard.

Positives:

It feels quite natural, and takes little time to get used to.  The hand position is rotated some 60-70 degrees from horizontal, and this should help with RSI concerns.

There is a middle mouse button!  I haven't had one of those for ages, but it's great, especially in Linux where "button 3" is the preferred way to do a quick text paste between windows.  For most mice, the scroll wheel doubles as the middle button, but it can be difficult to press a wheel without turning it at the same time.  This is much easier for me.

Sensitivity is adjustable on the mouse itself, in four steps (high, medium, low, extra low).  I find that either of the middle settings works okay for me; high is out of control, and extra low makes it hard to get across the screen.  So the range of adjustment seems pretty reasonable.  I can conceive of situations where I might want to change sensitivity temporarily - say, when doing fine detailed graphics work.  This mouse will let you do the adjustment without messing around in the operating system's control panel.

Negatives:

The mouse body is lightweight plastic, and on a smooth surface the thing moves too easily.  Why do I care?  Isn't easy movement a good thing?  Well, not necessarily.  It matters in this case because the buttons are actuated horizontally.  I cannot click a button without jiggling the pointer.  A mouse pad of the right texture might help here, but what the manufacturer really needs to do is put some inert mass into the mouse body.  Or, they should provide a compartment to let the end user add weight "to taste" without having to take the mouse apart and void the warranty.  The wireless version of this mouse probably avoids the problem by virtue of containing batteries; keep that in mind when making your choice between them.

**LATE EDIT REGARDING MOUSE WEIGHT**  More than a year later, with the product well out of warranty, I finally looked into this issue.  The bottom plate of the mouse can be detached via 4 screws: two are under the middle product label (feel around for subtle indentations, and stick a small phillips screwdriver through the paper) and the other two are under the front-edge slider pad, which is easily peeled away to expose them.  Once the bottom is removed, you can see how much central space you have to work with.  My solution was to take a handful of metal hardware (mostly computer case screws, but anything will do if the pieces aren't too big), put them in a plastic bag to prevent disturbing any electrical connections, tucking them into the mouse body, and then reattaching the base. It makes a night and day difference.  The added mass makes all movements more positive, less squirrelly.  I'm not using a pad, but putting it directly on a hard desktop surface.  Because this works so well and is such a simple modification, I'm increasing my review rating to 5 stars.  This is now an *excellent* mouse!

A tip just for Linux users:

Firefox, at least, expects any extra "back/forward" navigation buttons to be reported as numbers 8 and 9.  On this mouse they are unconventionally numbered 8 and 10, 9 being reserved for the mouse wheel (scroll-up=4, scroll-down=5, wheel-press=9).  Depending on what desktop environment you run, you might have a graphical control for button assignment, but the following command, as part of my X session startup script, fixes it for me by swapping 9 with 10:

  xinput set-button-map "Kingsis Peripherals Evoluent VerticalMouse 4" 1 2 3 4 5 6 7 8 10 9 11 12 13 14
158116
The scrollbar got messed up out of nowhere. Scrolling down takes me up- but the guidance of the mouse itself is nice.
3032362
The good: This is as precise as you would expect from a Wacom input device. Having a mouse that's designed for the tablet surface is convenient; there's no worry of scratching your Wacom when using a device designed for that surface. It also works with later version mice. Wacom removed the "Intuos4" portion of the product name for this same model when they released the Intuos5 tablet.

The bad: The scroll wheel is slippery. There's no ribbing or coarse surface as with other scroll wheels, but there's enough resistance that it doesn't move easily. It's made of a very slick and only slightly rubbery plastic. I frequently have to lick my finger in order to prevent my finger from merely sliding over the mouse wheel, or I have to constantly bear down a bit and risk misclicks. I've given serious thought to trying to score the surface with a razor blade in order to give it more of a grip, but I may still return the thing so I can't do that yet.

The scroll wheel jumps in coarse clicks. I would guess that there are only 16 or so clicks for a full rotation. This means the wheel has to be set to be very slow with lots and lots of spinning to move, or one has to live with scrolling pages 1/4 of a screen at a jump.

The ergonomics are bad for any but the tiniest hands. The mouse is not as long as a typical mouse - if you've used a notebook "travel mouse," you know how that feels. This one is also taller than typical mice, giving it an almost ball-like shape in your hand. It has an unusual downward slope toward the buttons. I've got hands that are only slightly larger than average, yet I have to contort my hand like I'm posing for some kind of kung fu "eagle talon" move in order to rest my fingers on the buttons and scroll wheel. This thing makes my hand ache. I'd love to see one with a profile more like Apple's wireless mice.

The verdict: I'll probably send it back and get felt feet for an existing mouse, or try to get used to the Intuos5 touch input.
4764217
Got this mouse because the scroll-wheel on my Logitech mouse finally stopped working after 6 years. The precision isn't as good as the previous mouse I had, I tried adjusting the settings and sensitivity but maybe it's just because I'm used to the old one for so long. As for the scroll-wheel which is the reason why I purchased this, it is smooth and works nicely!
3409645
Installation is a bit cumbersome. After that the mouse felt great and was fully programmable and functional. The best part of this mouse is the feel; the weight, smoothness and the size for my wide hand. I have used this mouse for all of 30 hours and the only thing responding is the scroll wheel. All the other buttons are dead, even the LED on/off button on the bottom.
3023124
Review-
This mouse is worth the $10, I work with computers 8 hours a day and this does feel more comfortable to use. It is ergonomic, it isn't as much of an angle change as I thought it would be. It feels like maybe 10 degrees of difference from the way my arm is positioned. Other reviews mentioned the buttons were harder to press, I believe this to be because the buttons are being pressed sideways, and there is nothing to stop the pressure from your finger (as opposed to pressing straight down and having the desk take the pressure). I found that I have to use counter-force with my thumb when clicking. The only other issue I had is the scroll wheel seems to not be calibrated properly, I've only used this on one computer, but when I scroll using the scroll wheel it bounces up and down. I often have to scroll multiple times to scroll one page.

*******EDIT********

After my last review, ANKER offered to replace the mouse under warranty. I sent them the necessary information, and received the new mouse within 2 days. Very good customer service. The new scroll-wheel works like a charm. I'm glad I got it back, I was beginning to miss it. Definitely worth the money, especially because of the great customer service.
2993133
It feels great in your hand, the arch is just right, at least for a female hand.  I don't get tired of using it for hours.  The mouse itself is very responsive and precise.  It is also light to carry around.  And, it works with Macs, just let you know.
768769
feels great in my hand, but would be better if it were wider on the right side to support my other 2 fingers, if you're gaming all day the lack of support can cause a little discomfort

i love that the side buttons are above my thumb placement, but the you can still accidentally hit the side buttons if your thumb slides up because the buttons still register from hitting them at an angle, would have been nice if there was a lip between the lower buttons and the thumb area to prevent this

---------------------------------------------------

edit: resolved the follow issue, simply flip the switch on the mouse to performance mode
then go to the configuration software click the pointer settings(mouse with gear by it) and set the response rate to 500, not sure if 250 works but i know 125 doesnt
you cant do that if the switch is set to endurance mode

V disregard this section unless diagnosing the same problem i had V
aside from those minor ergonomic issues, i do have one major issue
i don't know if its my particular mouse or if others have the same problem, i cant find anything about it online
if im moving the mouse and try to use the side buttons they don't work, and if i press them while the mouse is moving it while keep registering the button press as if im holding it down (even though im not) until i stop moving the mouse

i don't even use the side buttons in action games because of this, which makes the mouse almost completely useless for me under those circumstances, i may as well use any other mouse
3185170
I moved from the Logitech MX310 to the M500, and the one thing that jumps out at me is "scroll wheel". The scroll wheel on the M500 is definitely the most flexible I've ever used, but it seems to trade some precision for that. Even with the wheel's "friction" engaged, the mouse wheel still tries to scroll a little when I click it (middle clicking links and tabs in Firefox or Chrome), but I've gotten used to it. If that seems like it will drive you crazy, you might want to avoid this one.

Also, Buttons 4 and 5 (back and forward) are in a place that actually makes sense. As in, you can push them without changing your grip.
1116880
By reading the reviews on Amazon.com, I see that the quality of mice from Microsoft has dropped in recent years, which led me to find another manufacturer. I found this mouse by Logitech. It feels good in my hand, and it works good. I like the "shorty" receiver, and I had no  trouble loading drivers and installing it.

I like everything about this mouse, but there are 2 little niggling things that I'm not thrilled to death with.

1. I don't thing the web scrolling feature adds much to the usefulness of the mouse. It's there, it works, ho-hum.

2. The PC had to be booted before it would pick up the new mouse drivers. This suggests to me that you won't be able to install an operating system on cold metal using this mouse. Not a real big deal, but you'll have to bum another mouse from somewhere if you need to bring a PC up from scratch.

In any case, it's a fine mouse, the price is right, delivery is right, and there is no muss, no  fuss getting it  in. It probably took me a bit less than 5 minutes to get it running. If you like the web scrolling features, you'll like this  mouse.

Charlie Brown
1020639
the mouse actually works and connects easily to Macs or Dells.  but it's a bit too sensitive . I know some gamers like that but I don't .  I use my computer for work and it could get annoying
632371
I'm working under Windows 7, so my mouse works just fine. Got the drivers from their website and didn't have any hassle setting it up.

The mouse itself feels amazing and I got used to it in only a few days. My had feels extremely comfortable with it. The buttons are placed in good locations and have nice response.

The ONE drawback that I REALLY dislike is that they're using Razer's Deathadder's mousewheel, and just like my deathadder that I have since discarded, this wheel stops losing its precision after a few months of use. The mouse will jerk in the opposite direction from where you scroll it, mostly because the wheel is made out a squishy plastic and the divots for each stop position are extremely small.

EDIT: An example is here: [...] it seems like this can be solved with lubricant or simply blowing on the mouse. Because this is solved, the mouse is great!

I'm very displeased with this decision by Func, as the rest of the mouse is a great piece of engineering and ergonomics.
690348
The design of this mouse feels good to me. I have large hands so it's a bit on the small side but every mouse I've owned has felt that way. The drivers installed easily and it has worked like a charm since. This may be more of a preference, but the scroll and cursor movement speed was more than I liked. I could tell that it was quite a bit higher than my previous mouse. All I had to do was adjust the settings to slow it down and now it's perfect. It all depends on each person's preference but settings can always be changed.
508525
Good mouse, though scroll wheel clicking isn't durable. Offset by being cheap to replace.