I wanted to like this mouse, what with the cool red light, but I use a mouse all day, so comfort and accuracy are much more important, and on those scores, it really doesn't work that well. First off, some people think it is too big, but I find that I have to cramp my hand to hold it, and with sides that slope inward, there is no comfortable way to grasp it. OK you think, so I'll rest my hand on it and just slide it around. But no, if you do that, you'll find you're constantly pressing buttons (especially the right one) you never meant to. In the end, you find yourself trying to squeeze it and hovering your hand above it to avoid false clicks; all of which is very tiring. So, sadly, thumbs down from me. Back to Logitech MouseMan, which IMO is a much better "fit".