I owned an '03 and it was a disaster - poor trim and finish, leaks, silly interior flubs in design ... altogether an awful car. It was shocking. But, having been a Benz driver since '89, I felt the urge to give it one more try before moving (like everyone else) to Lexus. I have been pleasantly surprised by the major improvement in quality in this new model. The top is infinitely better in all respects, the interior trim is higher quality all around, the noise level is lower, the finish is far superior. It's as if a different car company made it. Anyway, they "saved" this one customer by putting some quality back in. I hope MBZ learned a lesson.
The quality and workings of the now fully-automatic top.
Certain minor features were lost from the '03, such as the auto feature for the front seats (when rear seat occupants get in) ... this should come back. Also, why on earth did the rear windows lose the auto-down feature? Odd.