I have since found out subsequent to writing this ...

I have since found out subsequent to writing this review the brake job recommended by the dealer service technician/advisor wasn't necessary.

I took my 2015 GL350 Bluetec to another service provider and he looked at the brakes and recommended only changing the rear brake pads as they were worn below the recommended thickness. This is pretty upsetting as the difference in price between rear brake pad replacement and full brake job is about $1000!!!!!! I plan on registering a complaint with my service advisor and the service manager given this information.

Mark is great to work with. I was a bit disappointed that it took 2 days to get my car back and one of the warranty issues was still unresolved.
I'm also a bit concerned about the longevity of the brake system and the fact that the cost of brake pads and rotors is extremely costly. I'm hopeful I can find an aftermarket solution in the future to reduce the cost of ownership.