I live near Vancouver and Henneken's is on my way home. They came well-recommended to me and I stopped in there shortly after buying my 16V last year (first Mercedes for me).
I wanted help with repairing my sunroof and troublesome power windows.
I found they were a bit abrupt there, but they highly recommended a nearby glass and collision shop. The fellow there gave me a high estimate for the sunroof and insisted in replacing the motors in the doors. Still wouldn't work after that - I think it was a problem with the switches being gummed up with spilt coffee on the centre console or something like that.

I go elsewhere, now.