Love the car when not having problems. Have had four major problems, most electronic, but think I have either a turbo going out or a "reprogramming of the transmission" - quoted from dealer service department. Still do not have their act together on quality. Problems with keyless go, steering wheel up and down feature. Have written Mercedes about quality issue, but have had no reply from them.
Love gas mileage. Drove to Dallas from NC, averaged 35.2 at speeds of 78-80. Like Sirius radio, but would have preferred XM. Got power galore until my above stated problem. Will find out more about that on my next service visit.
Would have loved XM over Sirius. Better verbage in owners manual.