I'll start off by saying that I like this mouse. It has a smooth glide on my mouse pads, the button functions are easy to reach and easy to use, the speed settings are also easy to use, and I love that it is wireless.
As for the wireless, so far, I have used it for a few games and have found it to be very responsive and quick. I've been shy of using wireless mice for anything but the trivial and normal desktop use and never trusted them for active gaming like in FPS. I haven't noticed any lag, the pickup distance is adequate, and it's standby time for response is more than long enough for my type of gameplay.
As for all of the buttons... I must admit that I have yet to use them all. This mouse does have more functionality than I currently need. I'm certain I will find a use for those other buttons, but for now, I really cannot comment.
The tracking seems to be spot on, from what I can tell. The track speed is easily changed and works well across my Hi-res gaming monitor, as well as my many screens in my multi-monitor setup.
However... I have found this mouse to be slightly small for my hand. I don't have the largest hands, but I do wear a size-Large glove, of which I would consider average. There is a little bit of discomfort when it comes to long gaming sessions (for me, that is 3 hours or more).
I do wish there was a smooth scroll switch, as I do appreciate being able to use that function on other mice, but I can't say that is really a detractor. It does not advertise having any special scroll features, so I shouldn't expect one, but I do wish it was there.
The only other problem I have with this mouse is the physical reconfigurability. No weights and no size adjustment (as I mentioned above, it is just a little too small for my hand). I would have, at the very least, liked to have an option for weights, given that there are two AA batteries powering the mouse.
I cannot yet comment on battery life, but I've been using this mouse for several days, now, and have not had to change them. So... that's a plus!
Last, the price is excellent. I bought this mouse for less than 40 dollars, and that is a steal. Even with the detractors, you can't really beat this price to performance.