I bought this item as a gift so I have no opinion on it myself but recipient says it is AWESOME.
I've been looking for a good mouse for awhile -- and this mouse is way better than good! Been through three mice over the last couple of years (most recently a MS Optical Comfort Mouse 3000), and the difference has been striking. It's light, responsive, accurate and very comfortable. One recommendation: follow the instructions, which strongly recommend leaving the Windows Mouse sensitivity setting at its default value (XP - sixth notch from the left). BTW - I'm not a gamer, but I do a lot of programming and having a very responsive and accurate mouse means a world of difference after hours of cutting, pasting, clicking ...
This mouse is great. It tracks well, the feet are fantastic, glides smoothly, the scroll wheel feels tight (in a good way) and well-made, the cable is a really nice, high-quality braided design, and everything feels really balanced and sturdy. The reason why it's a 4-star is because it can be pretty small for people with large hands. I usually have a fingertip-style grip, and this gets kinda tiring with this mouse after a few hours. However, one of the things I like the most about the mouse is the finish on top of it. It's a nice, satin rubberized sorta matte finish. Feels very good, soft, comfy, and grippy, even with sweaty hands, regardless of grip. Seriously good mouse.
Size-wise, I like it because it is small. I also like the fact that this mouse does not have any side-buttons which is very good for a palm-gripper like I am.
The only reason it is four-star mouse is because of its optical sensor. The sensor itself has fast response. However, the sensor seems having what we call "positive acceleration." If I move the mouse slowly, it has no problems. The pointer stops at where I wanted. However, if I move fast, the pointer ends a bit farther than where I wanted to. Other than ths so-called "positive acceleration," the mouse is a go-getter. Some people also complain about the firmware issue, but I have not experienced any error regarding firmware.
Although the Amazon description lists the mouse as compatible with MacOS, neither the box, the documentation, nor the description on the Steelseries website make any mention of MacOS. And, of course, there are no Mac drivers.
When plugged in (to my Mac) it does indeed work, but I get there feeling the company made no effort to make it Mac-compatible, it just "accidentally" works. The left/right-click, and scroll work, but there also seems to be another button near the scroll wheel; without Steelseries software, however, there's no way to program it (if it is, in fact, a button).
As far as performance, the mouse behaves in a way that I haven't encountered before. The relationship between mouse movement and cursor movement is non-linear (what, I believe, another reviewer refers to as "positive acceleration"). For example, if you move the moue half as fast, the cursor moves at 1/4th the speed (I'm not sure what the actual factor is). I find that when I move the mouse quickly, the cursor zips off the edge of the screen, while when I move the mouse slowly, the cursor creeps across the screen. I've tried to get used to this behavior, but it just gets more annoying every day (while I wait for a different brand mouse to arrive). I supposed it's possible this nonlinearity is adjustable with the drivers, but... no Mac software so I don't know.
On a positive note, the mouse feels good, moves smoothly, scrolls nicely, and seems well constructed. And when I contacted Steelseries (e-mail was the only option), I got a prompt response.
