I have this mouse, used for gaming for months and am currently using it right this second as I type this. Overall i love the mouse, except in the fast paced world of FPS, like TF2 or CS:GO, from my experience, i found myself missing shots, specifically head shots on a fairly consistent basis. Now from what I've gathered online, its about its laser design then optical. I thought at first this experience is psychosomatic, but after switching to the new Logitech Proteus 502 mouse which is optical, i confirmed my suspicions. I read its about the partial acceleration the laser design has, inherent acceleration, that was forcing me to barely miss highly accurate shots. Now i'm sure there is plenty of gamers out there that play a FPS like Bioshock Infinite, where this shouldn't be an issue, but in in a game like TF2 or CS:GO, where this matters, I would prefer optical, and my head shot to body shot ratio has gone far further in favor of head shots when using my optical Logitech.