Like others, we bought the car thinking we'd keep it for a long time. After 6 years and many, many trips to the dealer we are saying bye to the Benz. Thankfully, the warranty covered replacement of the entire dashboard assembly, brakes, phone, hatch and various other electrical issues. Unfortunately, post-warranty I was stuck with the bill for the struts, rotors, hatch (again) and a new $100 key! Like others, it's burning oil at a rapid pace. The car drives well, is very stable and eats up highway miles. Performance in the snow is fantastic - better than our Land Rover! Cargo/people hauling space is great.
Stability, solid feel of chassis and interior switches. Cargo capacity and people capacity. Performance of 4Matic in the snow. Indestructible leather (survived unscathed after 6 years with two small kids; cleans up well)
Quality - MB should take responsibility for the known issues beyond warranty (Oil consumption, for example). They lost me as a repeat customer.