I have made myself after a tenosynovitis and the fact that I am bound to + -8H working day at the computer, on the search made for an ergonomic mouse to "change" the position of the hand in the daily work to. I hoped before buying a more pleasant "work attitude" of the hand to the next disease of the wrist to prevent and I have already after 2 days to say that I find the work with the mouse quite pleasant. After half a day "familiarization period" (which you definitely need) went quite well already and feels full of relaxing hand attitude. Sure you can now after 2 days now not say overly much, but so far the impact of the mouse which processing and attitude of the hand is when mousing easy terms class. But would like to remark that the mouse for a person with smaller hands may not be so very useful.