This is a very good ergonomic mouse. It helped me when my wrist started to hurt from using a non-ergonomic mouse. I first got the Evoluent VerticalMouse, and it was better, but I didn't like it. Then I got this one, and it was the one! You have to use it a little differently from a regular mouse, but I got used to it quickly and it resolved my wrist issues. (Basically, you tilt it to disconnect it from the desk surface to move around sometimes - it makes no sense until you try it, but it becomes second nature in no time.) I'm selling it because I eventually decided to get the wireless version.Here are the quick videos that show how to use it. They are for a different version, but you use it the same