I drove one a couple of months ago (I work at Mercedes Benz USA home office). A surprisingly peppy little car. It is a fun car to car, believe it or not. The car I drove was a seqential clutchless 'semi automatic' and if you leave it in auto, the car is lethargic. Switching the tranny yourself transforms the car.
Plus it gets more looks than any other car I've ever driven!
-Z.