BMW's revived 6-series has always suffered from an unattractive rear, and this problem hasn't been fixed in the 2010 650i Convertible. Its lack of a proper roof also makes the profile of the 650i bland, so it's best to spend as much time as possible inside the car. And that part doesn't let down, as the 650i Convertible maintains BMW's reputation for superior handling. For the 2010 model year, BMW updated the cabin tech, building in the new iDrive system, but little else is new in this car. The engine doesn't yet take advantage of BMW's new line of turbocharged engines.