I just got a new SLK280 a few days ago. So far it has been near perfect. I was concerned about MB quality based on what I've read but so far so good. The car has great performance, styling, comfort and even good gas mileage. I'm fairly short and the Comfort Package with the 8 way power seats allowed for a wide range of adjustment. I restored and drove vintage British sportscars for 15 years. This car is as much fun to drive and seems to be very high quality. Styling is great. I'll write another review in six months or so and let you know if there have been any problems. By the way, I got the 280 instead of the 350 because it has plenty of power, better gas mileage and a $4K lower price.
Clearly, the retractable, automatic hardtop is great. It was the deciding factor between the SLK and the BMW Z4.
Large blind spot when top is up. Requires careful use of side mirrors.