I haven't used pop-a-dent, but I did take my 85 380sl to a Dent Wizard shop to have a shopping cart ding removed. Didn't work. They use a 4-foot pry bar with a pivot point attached to the car and attack the ding from inside. The technician got most of the ding pushed back out, but was afraid to push any harder on the center indentation. Afraid he would crack the paint. No charge. All this to say if a man with a pry bar can't do it, I don't see how a suction cup could. The technician said MB uses thicker metal than most cars.

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Thom