The two fingers that allow me to press a typical mouse causes my forearm to trigger pain.

Anybody in my pain situation will look at this ad and think that it's wonderful. When I use a trackball I use my thumb to press the button for dragging things. So this mouse would allow me to do that. Not like I want this mouse. I'm happy with my trackball. But for people that have my pain situation and have not come across a decent track ball, they would like this.