A little bit of metalworking knowhow has converted a perfectly functional quad into a perfectly functional quad that can do forwards and backward rolls. You're still out of luck if you rolls the quad on its side, but I'm sure the creators of this vehicle are working on putting a quad in a hamster ball next. Overall, it's a pretty creative idea, but at some point one would expect these kids to just learn how to ride a quad rather than having to worry about constantly rolling it. [DV]