Purchased my C280 AWD in Oct. '06. The ride is truly smooth. It takes road bumps with no problem. The sound system is great and the navigation system gets me where I want to go without getting lost. I had to take the car back to the service department since it was surging forward when my foot came off the brake. They discovered it was down a 1/2 quart of transmission fluid (and this is a brand new car). Needless to say, I'm gonna keep my eyes open to this potential problem.
Heated seats, sound system, navigation system. Very smooth ride.
Since I am a tall person, I would like to have a bit more leg room in the driver's seat.