It's true, my hands aren't exactly massive, but they're bigger than average, as far as sensitivity is concerned, i'll agree with all those who swear by it's sensitivity, but the design of the mouse is very lacking, think: wide, flat, and buttons in difficult positions, like he said, the scroll button is WAAAY up. The other thing that is crappy is that it's designed once size fits all for lefties as well as righties, it's the same mouse....for $100 bucks, I better be getting a right hand specific or leftie specific mouse, this 'one size fits all' crap seems lazy. As I said, sensitivity:GREAT, button layout and design: NOT VERY GREAT I would only recommend this mouse if you have a thin wide hand with LONG LONG LONG ass fingers...