I had some work done earlier this year at In and Out Auto Body in Rockville MD. Rick Ellinger at RC Imports (my mechanic for seven years and highly recommended on this forum) uses them every time he wrecks one of his Mercedes race cars .

Here's the info:

In And Out Auto Body
1074 Taft St.
Rockville MD

301-340-0393 main
301-340-0394 fax

They specialize in Mercedes and treat the cars with a lot of extra care. I was very happy with the work they did for me.