I've ridden one of these, or atleast something similar, at an arcade in the Easton Center in Columbus. Although it did provide a different feeling, it really didn't feel much like a coaster at all in my opinion.
Also, how is your favorite track 9 if there are only 4 (assuming you weren't being sarcastic, in which case I don't see the point).
"Find yourself a dream and, when you find it, chase it like a bull chasing a rodeo clown; don't give that clown an inch, not one inch" -Sean Kelly