These folks are great. I needed the A service (oil change, fluids, lights, and brakes checked) and a transmission service (fluid and filter) for my 2013 GLK 350. I need to mention, they did not "sell" me the transmission service because I requested it when I called. It's an older car with very low miles, so I suspected that it hadn't been checked before I bought it last year.
It may not have been the least expensive place I could have taken my car but it definitely wasn't "dealership" expensive. Plus, there were only Mercedes on the lot, so they know what they're doing. I'm pretty sure that's all they work on. I think that speaks to their knowledge and reliability.
They got my car back to me earlier than expected and let me know what I need to be ready for down the road as far as repairs/maintenance.
The garage is clean and looks well stocked. In fact, I don't think I've seen a cleaner garage at a dealership. The people are really, really friendly. I enjoyed every conversation I had with everyone there. Honestly, they were the nicest people.
I highly recommend.