Not a thing!
It's the best thing I've ever bought. Not the best CAR, but the best THING. THE most fun I've had driving. So I'm not sure I can be very objective in my review, but I've not spent anything unexpected on it, use it infrequently, and it always runs perfectly.
Admittedly it's not got the creature comfort of power steering, but that is the only thing I can think of that's missing (and it's only noticeable when you're parking up really).
Boot space is negligible, but not really the type of car you drive to move things around in. The Supercharger one (mine's a Japanese import) is apparently much better than the NA version, but I've never tried the latter.
Would you buy another car from this manufacturer? Yes
Review Date: 21st December, 2010