I would like to change the RS-As on my 2012 LTZ as well but I am reluctant to spend the money as they have very low mileage. They are poor in the snow. I put Firestone all season touring tires on my 2000 MB C230K a couple of years ago (close and convenient dealer) and no complaints. More comfortable than the factory Michelins and quieter imo. And way cheaper. But I can't speak for the winter performance as I don't like to drive the MB much in snow.