The primary buttons--left and right click, are far, far too sensitive. It takes no pressure at all to press either of them and I am constantly executing a left or right click whether I want to or not. I have to consciously hold my fingers up and they get very tired. I can't just rest them on the mouse or use the other functions without accidentally pressing one or both of the main buttons. It's tiring and frustrating.

I'm going to return it. It just doesn't work for me. sorry.