So far the tires have made a dramatic improvement in overall performance and fuel economy as well as extreme comfort. The Mercedes is a fairly large sedan and has been known for comfortable cruising but with these tires they are un---ly excellent for soaking up anything the road could throw at you. I've driven over wet, crusted, beaten, uneven concrete, filled with potholes deeper than Russian philosophy and I didn't really feel all that much. They're a fantastic set of tires and I will be buying these for my car for the rest of it's life. They're fantastic.