I purchased this mouse in July 2010 and I've had no problems with it at all, so the quality is good. I don't really use it for gaming, but I DO use it for producing 3D animation at home.
1st off, I usually use the medium dpi setting. The high setting is too quick for anything I need it for, but the slower setting comes in handy sometimes and it can be adjusted with the click of a button on the top.
My second point (and my favourite part) is that it can be used on just about any surface and not flinch while in use. i tend to use it on a wooden surface, but right now it's on the arm of the couch and, hold on a second... yip, it works on the back of the TV remote and my wife's bag with unfaltering accuracy.
Finally, it's also quite handy for the internet. There are two buttons up on the left side (just above where your thumb would sit) and it makes going back and forward through pages a lot easier than looking up to the corner and clicking the arrow every time. You can keep your attention on the page and just flick through with your thumb. It becomes second nature.
All in, it's a very handy mouse to have on a budget for any type of user, not just gamers.
Hope this helps.