Quality, all the way around. No complaints. However, I do have a problem with the CD changer in the trunk. The radio shows there is no CD in the changer when there is. Can't get it to work. Mercedes say's it will be hefty charge to fix! Other than that the car is unbeatable. I have only had oil changes and routine mait. done in 6 years. Mercedes knows how to build a quality automobile without question. This is my 4th Mercedes and without question not my last!