Guess I just like the way it rolls (it's got brand new rollers & everything in it, it was a new trackball when I got it). The PS2 circuit blew out on the trackball I had, so I pulled them out, and modded the case to fit the ones I bought to replace them (required me to remove the old mounts and mount these farther back from the encoder wheels, otherwise it wouldn't see the slits in it). I'd also need to enlarge the mounting hole if I did change trackballs, and at this point, I just plain don't want to fool with it, lol.