before use this mouse , I have a lot of pain in my wrist and finger from heavy computer usage in the office -lrb- 9 hour a day , 5 day a week -rrb- . initially , this mouse virtually eliminate the pain that I have in my wrist and index finger . but after a month or two of use , I develop new pain in different part of my hand . so I switch back to a conventional mouse . I switch back and forth with this mouse and a conventional mouse every couple of week for a few month , but stop switch when this mouse suddenly stop work . now , I use a conventional mouse and do hand and wrist exercise -lrb- I find a great video online but can not remember where I find it -rrb- daily . the exercise have help more than anything else . in my opinion , save you money and do not buy this .