This mouse is not very good. I was looking for an optical mouse without a whole bunch of buttons, like this one. I got it and was happy with how precise and smooth it is. But it's extremely cheap feeling. It's super light. The buttons feel like they will break after a bit of use, the wheel is so loose it sometimes moves on its own. Microsoft tried to save some money by making this mouse for both righties and lefties. The comfort level is nowhere near that of the old Intellimouse. In my opinion, the Intellimouse is a better mouse, although it requires cleaning the ball out once in a while.