significantly reduce my repetitive stress issue cause by use the mouse , so it be worthwhile . unfortunately , it have no scroll wheel , which suck , and it be not nearly as precise as use a normal mouse . consequently , I leave a normal mouse plug in next to this one , in case I need it ... or in case someone else need to use my pc . I wish 3M make a more advanced and pimped-out version , with better material , better switch , and a SCROLL wheel . I would pay at least $ 100 for one .