I test drove the C280 and the C350 4matic side by side and it was an easy decision to go with the extra power of the c350. I also drove a 2006 C240 4MATIC and it was clearly underpowered for an all wheel drive car. Especially with all wheel drive I think the extra 40HP between the C280 and C350 make it hard to tell its working all 4 wheels. Wow is this car fun to drive! Paddle shift manual possible to over-ride automatic tranny and when babying the gas it drives like butter.
Smooth and fast acceleration and smart transmission.
Knobs and buttons are a bit traditional, classy mind you but a bit knobby in the controls. Gas mileage should be better for an engine of this size and car weight.