The vertical mouse review was great! You get it! My doctor told me to play solitaire on the computer as part of my physical therapy. But it hurt to play very long. I hurt anyway so I thought nothing of it. But when the pain never improved I decided to take a closer look. I did notice that my arm is twisted nearly to end-of-stroke.
(maximum limit of travel) But why my doctor couldn't bend his mind around the body not be comfortable working constantly near end-of-stroke I can't tell you. The human body works best near safety-neutral-zero. What's safety-neutral-zero? An astronaut's body; asleep, in space, and unrestrained would go to safety neutral zero. His body would move so as to balance all forces from his muscles and end up in a "open fetal position". That position is nearly always in the middle of the range of motion of any given joint. I know a good thing when I see it,that product is for me!