You should definitely discuss this with the service advisor, the tech(s) and the service manager.
You are taking your car to them because you trust them. Let them know how it went. The feedback is invaluable.
This also lets them know what your expectations are. If you handle it well and diplomatically you will all benefit.
'03 E320 Wagon-Sold
'95 E320 Wagon-Went to Ex
'93 190E 2.6-Wrecked
'91 300E-Went to Ex
'65 911 Coupe (#302580)