Im at 8-9 almost all the time, its great in games because if your getting atacked from the back, if you strafe sideways and flip around you can kill them before they kill you.
Jesus you guys have low sensitivity. I'm between 8-9, I just use 8 most of the time though, I strafe for 9 but sometimes I forget to set it back so I just play.
Mine is on medium for sniping, because i can get to the dudes to snipe quickly enough, i can follow someone who's running at their pace, but i wont be spending an hour aiming