I bought this mouse to alternate with a mouse, because a drawling epicondylitis. Working on a computer all day, with a keyboard number pad and two screens, I tend to let go of my hand too far to the right; but even so, with this new mouse, I feel relieved.
The small size of this mouse fits my small woman's hand.
I have not yet exploited all possible programming for the buttons, but I know that there are many choices.
I do not regret my purchase.