They are cute and novel, but the mileage isn't great; somewhere I read they get about 30mpg. They are good for parking in places that normal cars can't park, though. Bikes are better at all of the above.

I saw quite a few in France recently, and they do make a convertible (soft top).

I'd also go with a Honda Fit or a Toyota Yaris hatchback over the Smart. Better price, better mileage, more room.

Too bad the Mayor's new wheels aren't of the 2-wheeled variety. That would make a statement!