Razer Mamba is great. My previous mouse was a Copperhead. Performance wise at the same dpi it is exactly the same as using the wired Copperhead ( i play a lot of ut insta and never liked previous wireless mice).
Driver wise, the vista drivers seem to be working 95%. As a previous poster said, the configuration program takes longer to communicate, and i have problems being able to swap profiles eg i have fear 2 profile as the game wont let me assign the side buttons. I still haven't been able to use this profile with windows 7.
Also every now and again, maybe once every 15 mins the crosshiar will stick for a split second, which is troublesome whilst twitch gaming. However during 3 months of use previous to windows 7, i played for 3hrs each days and never had this problem, so i guess its because im using vista drivers?