Don't know how good it is for FPS though, most people say Wireless are BAD BAD BAD choices for FPS games.
I used wireless mice when I played some FPS games competitively for 3 years. If you buy a high end one, the difference is so minuscule its not even funny. And if it did cause a .001 response difference of clicking the mouse or something, you're more than likely to blame your death on something else, like lag. Most of the guys I played with preferred the wireless since you didn't have to worry about the getting their cord caught on something on their desk.
I've since went back to a wired mouse for a different reason. My old Logitech MX700 wireless used 2 NiMh AA with its charging base. It made it very easy to replace aged batteries. I then bought an MX1000 which used a proprietary Li-ion battery. The Li-ion did last longer on a charge, but after 2 1/2 years it pretty much crapped out and it made trying to find a replacement not fun. Though Logitech did have a 3 year warranty on the mouse, I could never find the receipt for it.
Currently I'm enjoying the Logitech G9 thoroughly.