I have never worked for a dealer. But, I feel as though I know the cars as good if not better than many dealer techs. I have dealer techs call and ask for my input all the time.
The bottom line is, if a tech will read and keep up with the newer models, has a good attitude, will buy the tools needed and works in a healthy environment, you should be safe.
ASE CERTIFIED MASTER AUTO TECHNICIAN
MERCEDES SPECIALIST 11 YRS