My wife and I just test drove a SLK 55 AMG the other day. This is a normally aspirated V8 AMG engine, but the car felt very solid and very fast. Since it was only 1 drive, I cannot give my feeling on under/over rated, but it felt very fast. The 7 speed tranny adds to some of this, so it would take some time in the seat to figure. Not sure of its weight, but it would easily out run our SRT-8 Magnum. It is on the short list for our next fun car.
Todd
Todd