I had the Razer Mamba as a wireless
mouse for two years until this past month when I passed it down to the kids. It's the best wireless
mouse out there still today. I had a batter life in real world usage of about 8 house before having to place on recharging dock.
Ouroboros is a slight improvement up to 8200 DPI and an extra two hours of battery life. The mouse is flexible and strips away down two more layers for a personalized feel.
If you in the market for a solid very responsive wireless mouse, it doesn't get better than this one. Not all mice made from a company are good but this one for as wireless go is one of Razer's best mice. It's no FPS mouse but it's the best wireless.
I went back to the wire for best FPS mouse and found it elsewhere.