
Wheel consideration is a factor for me. I wouldn't have a set of wheels that's difficult to clean. My wife's SLK 350 has the AMG 18" five spoke wheels.

My SLK has the TSW Bremma 19" wheels. Both style wheels are easy to clean by reaching inside and cleaning the entire wheel. I didn't like either the stock SLK 350 17" multi spoke wheels or the SLK 55 stock 18" multi spoke wheels. Looks and cleaning were equally a consideration.