Some of the plastics that Mercedes uses in less obvious parts of the interior – the seat base trim, the interior of the center console lid, the vanity mirror surrounds – could be nicer to see and touch. Some of the controls have a hard, cold feel rather than a soft, dampened response to the touch, such as the headlight switch, but this is a typical German trait more than anything else. Otherwise, the S550’s interior materials are terrific, with plenty of gorgeous leather, rich wood, and solid metal detailing.