a mouse is more than a mouse, it can be the deciding factor wether you win a tourney game, or go home a the runner up, yes you do need skill, but a mouse is also critical in being a great gamer. i guaruntee that if you do game alot, then try switching to a Razer and see how much better you will do, and besides, the more sensitive a mouse is the faster you can point your gun to shoot. try doing a little experiment, use a regualr scroll mouse to play a game like CS:S for example, and see what you get for a score. Then use a razer and see what you get for a score, SENSITIVITY is a good thing. and the Razer diamondback has 1600DPI, thats twice what the MX510 has.