ive used a million different mice, including mx500/510/518/g5/copperhead/boomslang(the ball one! lawl)/deathadder
definatly the mx series has the best shape of any mouse hands down, but the sensor on the death adder is by far the fastest tracking at any sensitivity, especially low, you can crank it all the way down and it still picks up perfectly up to something like 3.9 meters per second (proof
http://www.esreality.com/?a=longpost&id=1300293&page=4). And thats no negative acceleration or choppyness or skipping, and ive tested this kind of thing with every mouse i've used, moving it the entire length of the pad from slow to very very fast and back, ingame, and seeing if the dot ends up in the same spot, the deathadder is fu!@#ing pixel perfect!. The mouse i used before this was the G5, i really like that you could take out the weights so easily, the DA has a weight in it's ass that seems strange but you get used to it. I gotta say, the g5 and laser mice in general dont seem to be at the level of optical.
ps. does anybody know you if you can take the deathadder weight out like you could with the 510/518?