 Bought a 2014 e350 convertible with 11,000 miles on it.  It was a MB certified pre-owned car.  Fun to drive; problem was the drivers side window would not fully close.  After four trips to the dealership in 4 weeks, the window would not still not consistently close.  Hard to own a car you can't drive in the rain.  The dealership was great - they tried the specified MB repair four times but it would not hold.  The dealership took the car back with no hassle.  MB was not good (: I spent $1,500 on prepaid maintenance that they would not return.  Didn't matter that the car could not be used as a regular driver.  You should be ashamed MB.  My next convertible will be another BMW.