It is fully customizable, you can allocate shares to its usual buttons and even create user profiles (when one is to use several). There already has 6 buttons, but with keyboards keys can leverage its 6 buttons to infinity. It may seem tedious to learn these shortcuts at first, but then what comfort! Simply identify the programs / actions that are done regularly (explorer, back office, launching a program) and we avoided a lot of clicks.
After a week, my tennis elbow is still there, but it seems less strong than before. I read that it took several weeks to see the result.
For cons, I made a mistake: simultaneously buy a mouse pad with gel wrist rest. Such a mouse pad is not at all adapted to this mouse who stands on the side. Because the wrist is rotated 25 ° and so this is the side of the wrist resting on the carpet: pain in the hand and fingers after a few hours, I was forced to go back to my old mouse pad.