I do! I ride one of those!
Or more specifically, I ride a ZMC 250UU, the MFC's uglier brother. The only difference between the ZMC machine and the MFC machine, is the ZMC has a solid rear axle, a Pipe with a sprocket on it. Reverse gear is moved into the engine, where first should be.
(Makes for some real fun after I've been riding the bikes for a while, adn vise versa.)
Same Owners manual as the ZMC machine ironically, you kind of get to guess about the reverse gear thing... Not so Kewl...
All in all though, the machine has taken some hard-core punishment, and never stranded me yet. I expect I've got about 300 plus hours on it. Motor Runs better than ever....
--Vince