I brought my car there about a year ago as it was running very rough.
They charged me $300 and gave me a sheet of paper with an estimate of $5000 some odd dollars of "needed" repairs but not a diagnostic of the problem I had.
I asked them how much to fix the problems only and they said you have to do what's on the sheet step by step in order to find the problem. What a joke!! I ended up taking my Mercedes to a "Non-Mercedes" shop and they fixed the problems I had for $150.00 this place is rip-off!!