Mouse is important for me. I use it too much, so my right and left hands pain on different parts :-( I look for different types of mouses in order to make my hands feel better. This is the one of best to make me comfortable, free my hand, don't have to on desk and free stting position, can switch either left or right hands. Good stuff, I hate to find this product too late. The price little bit high, but still worth.