WOW! I remember when this was anounced I was amazed! I believe it is the worlds fastest street legal 4 door sedan? Also a month after they came out with this my dad and I went to a benz/bmw/porsche dealership to test drive the R class only and we ended up test driving the CLS, Cayenne, E class dieasal. (320 CDI?), and thats it I think...oh I also sat in a S500 but not drive.