I was last week in Stuttgart and I saw three silver CLS 55 AMG with license plates from BB (Böblingen) driving around, I even drove next to one for a while.
My first impression? The CLS looks bigger than a Mercedes S-class. Second impression? It looks more elegant than a Mercedes S-class and definetely more attractive and eye-catching. Third impression? It looks weird, interesting but somehow not really as sporty as I thought it would look when I saw the first pictures.

I'm pretty sure that the CLS will be a huge success due to it's eye-catching look but beware to order one before seeing it live for real: the CLS looks huge and it does not look sporty. It looks very elegant, very special though.