Pros: Affordable. DPI button is nice if you care about that sort of thing.

Cons: You get what you pay for. After about 7 months of daily use, the wheel likes to randomly stop working, sometimes the wheel doesn't scroll (it spins and nothing happens), and the left button has started to stick for long periods of time. Autofire button placement is also annoying, and the forward/backward buttons were mapped backwards on the mouse I received. The plastic covers are also coming off.

Overall Review: It is very cheap, so I didn't expect it to last very long. It is comfortable to use, but I have pretty small hands for an adult (about 6" from palm to fingertip). The scroll wheel started acting funny after about 4 months.