the concept be so great . the follow through be MISERABLE . the ball be way to sensitive despite any configuration I have attempt in the software . it only work reliably from about 3 foot despite any claim make by the manufacturer . have the left click and track ball so close together cause the use of one to effect the other . if you be try to use it on a big screen you 'll only be frustrate by the lack of precision necessary for the task . unfortunately , this be make for use in the living room where it be pretty much useless .