 I had this SUV for a year now and I must admit that MB has not yet sorted out transmission and brakes on this model.  It seems that "electronic brain" is not governing transmission shifts correctly and is very evident during "stop and go" traffic: 1-to-2 gear shift, during downshift or at brake time.  Just touching the brakes, creates an immediate and unnecessary downshift, sometimes more than one gear.  Good vehicle for someone who does not care how it drives - just gets there.  Although, it is very good in the snow.  During cold weather, electronic cluster displays erroneous messages (Low Coolant and Washer Level) and front shocks made strange noise, until the car warms up. 