This car is SEXY , like an Italian car built by Germans. It looks fantastic, it goes like hell, seats four people perfectly (unless all you friends are in the NBA). The engine noise is sweet, the dynamic seats are a trip - heat, cool, massage AND inflating side bolsters to keep you in tight. Everyone stares and gives a thumbs up. The AMG version is worth extra money, the feeling you get when you blast down a highway is pure exhilaration. I traded in an Infiniti FX45 (a pretty quick SUV in its own right) for this baby and I never looked back.
The engine. The snarl of the engine. The dynamic seats. The looks from other drivers. The ipod jack in the glove box.
Better interface/more user friendly info systems and nav/audio. I wish you could get the glass roof like in the E and the new S class. The color choices are really stuffy and bland for a car this exciting.