A little confusing at first after years of mouse use, but you get used very quickly. After a few months of use, I can say that the main goal is reached: I have no sore tendons of the wrist. A bit one loses precision with respect to a good mouse, but still manages to play certain games without problem. My only regret is not having found the Easy-Scroll Wheel that I had on my previous mouse Logitech MX.
