I've taken a CL 500 on the test course at Mercedes Powertrip last year. I waited in line for 40 min. to test drive it ONE short lap with my girlfriend. WOW. So quiet, so smooth, very responsive, BUT... it's a heavy car and going through the twists you feel it. It accelerates fine, but it's not a sports car by any means. It's too big and heavy. But as a luxury cruiser, it doesn't get any better.