I didn't have the full kit with trackball (played it in MAME) and I'd still give it a 7... thus I bumped the score given to an 8 guessing that it is slightly better with a real trackball (maybe 8.5, but it wasn't an option).
I'd give it a solid 8. I've only really played it trough MAME, because I haven't had a chance to play it any other way. I do have a trackball on my dedicated MAME cabinet, so it really does make playing the game much more enjoyable.
I played the full kit back when it was at the LV Hilton about 10 years ago. I've written about it before (I remember writing a review on DolphinLord's Yahoo Club, the predecessor to this forum), and I'll summarize:
The premise is just a tension filled game of get the ball through the maze with the track ball before time runs out. The cool (or very annoying) part of the game is that when you screw up (by touching any wall), the air jets blast you. If you're not ready, it's startling as hell the first time. If you're like me, and you get really locked-in/focused on games like this, its a bit annoying. Gimmicky game, anyone playing it on mame or any other nonsense without the airjets is absolutely not getting the full experience.
Gave it an 8. It's a well-made game, just too short. I've only played it with the Unibios joystick cheat. The last leg of the last stage is impossible to clear with the joystick (it can't go fast enough to clear some of the last obstacles) so you have to turn the difficulty down to pass it. Otherwise, it's surprisingly playable with the joystick. It's easy to forget what you're missing.