i got one at Kmart a while back on clearance for $12. i brought it home, fired it up to see if it worked for about 2 minutes, then proceeded to gut it and interface it to the PC via a mouse hack. i fully intended to use this as a trackball for a bartop i was going to build. however the performance just wasnt there. the ball doesnt roll easily. if you roll it hard, it stops almost instantly after your hand leaves it. the rollers are tiny metal rollers with rubber cushions on them.
i dont know how you would ever play any kind of bowling or golf game with it. i played a little centipede with it, but it just wasnt anywhere near the same experience as playing with a real arcade trackball.
if you can get one cheap, it can be a fun little project, but dont expect this to be an arcade quality product, because it isn't
if you do plan on hacking it...this could be useful
