I just wanted to see if anyone had suggestions on where to service my GL350? It has 1 year left of manufacturer warranty and it's a CPO and I purchased an additional 2 years of CPO warranty. Being its under warranty for 4 years, I want to find the best MB service out there.

Motorwerks Mercedes Hoffman Estates and Motorwerks Mercedes Barrington are the closest dealers to me. Is one of these service departments better than the other? Should I stay away from both of them? Thanks for any input!