 I loved that GLK350 was so smooth, it is my first Mercedes.  My SUV was purchase on 5/21/2009, and at 90 miles the radio/command center would not power on.  So I brought the SUV to the dealer they checked it out for a day and said there was nothing wrong.  A week later at 110 miles the Tire Pressure Monitoring system malfunctioned.  And would report tire pressure issues.  Now it just says Tire Pressure Monitoring system is inoperable.  And the radio still dies.  I have brought the car back to dealership and they are looking into these issues. Its been a day and still they don't know whats wrong :(  If you are considering buying GLK350 you should think twice.  As the build quality is sub par.