Does it do anything else besides 2500 dpi?
I dont know a single FPS gamer that plays with anything over 1600... (most are between 400-800)
I realize you can just do the math quick and adjust ingame for the same overall sensitivity, but some games are wack, some people are particular.
If this includes like 400/800/1600/2500 or something like that, then I say GJ logitech. the price point is great also, $39.99.