They're horrible in the wet, brutally quick, and are about 3ft square. You must be under 4ft to drive one comfortably, and you can fit under articulated lorries.

Doesn't stop me from going 'YYYAAAAARRRGGGHHHHHHHHH!!!!!' whenever I get in one and planting my right foot to the floor though

And the rotor tips need doing at 60k or so but from what I gather, it's not the big deal everyone makes it out to be, only what I've been told though.