Saw them first in London back in '05. Now they're sold here in my area as well. Fairly expensive for what they are too, and apparently the US models don't get anywhere near the mpg that the ones in the UK do, probably owing to all the emission crap the EPA requires.
Don't think I'd feel safe in one. Too many big SUVs, F250s, and the like running around here. In an accident one probably would be toast!
Cheers,
RR