ELECOM M-DT2URBK-G Trackball Mouse Review

I have a lot of pain in my wrist, not up to the carpal tunnel syndrome, but very sore when I use a normal mouse. Switching between using my Wacom Intuos 5, Evoluent Upright ergo mouse, and my old Logitech Cordless Trackman on my Mac Pro running OS X (Mavericks), I use two 20-inch Apple