I knew the mouse already by my employer, who had me at the time a provided. The mouse is just top. Fits comfortably in your hand and is very easy to use. Very gewöhnunsbedürftig. I've now got myself because of my tendonitis for home and notice the difference immediately. The button can be programmed even all with a free driver from Evoluent. I would mouse every friend of the problems with the wrist has or wants to prevent this.