I'm with Andrew on this one.  Very early in the process of making my
conversion decision I dropped by to chat with my friendly local
emission/mechanic guy.  He is a very good mechanic and told me that he had
absolutely no problem with working on the conversion that I selected.  I
went with the Subaru.
Any garage with the skill and knowledge to work on a Subaru can work on
these conversions.  The beauty of it is, everything is VW except the engine.
 The engine is all Subaru.  If your garage has the diagnostic tools
necessary to plug into a Subaru, they can plug into the conversion.
Another reason that I chose my particular conversion was because it
requires so little service anyway.  Several of the owners with whom I have
spoken, had not been under their vanagon in over a year.
Mike