Check your insurance policy. It may say that they will only pay for "quality aftermarket parts when available". If you can't win the argument that this should not apply to MB cars, then you might be able to work out something with the shop where you pay the difference to get authentic MB parts.
Make sure you go to a shop that guarantees EVERYTHING to your satisfaction. Fit, finish, color match, everything. If they don't, keep looking. It takes a really solid shop to provide a 100% satisfaction guarantee. They can't all do it and still make money.
Paintless dent removal is pretty limited.
Experience is something you don't get until just after you need it.