I agree mouse sensitivity is important in bf3,especially having a variable Dpi that you can change on the fly.Currently i tend to stick to just 3 settings which are 1800 dpi for general play including sniping but if its a long distance shot i knock it down to 1200 and the last setting i use is in the tanks at 5040 dpi which i find good to make the turret turn quicker..I could use upto 28 settings on my mouse which has a switchable 7 mode option enabling me to have 7 different set ups including button configs but stick to just 1 to keep it simple...all from a sub $50 mouse,a Prestigio PMSG 1....very under rated and not very well known but very capable non the less..