These guys are located just north of the BMW and Mercedes dealerships. It's essentially a little garage with a room and a couch. It's not exactly easy to find but once you find it you're good. It might seem sketchy at first by the looks of it but I can say It was a really good experience. They helped me diagnose some problems with my BMW that I was having trouble with.

The guy I talked to really knew his stuff. More than someone from the dealer (in my experience) I know my stuff when it comes to bmws and this guy was spot on. He correctly diagnosed my problem and I did the repair when I got home.

I would give them an A+ and highly recommend them as a dealer alternative. Pricing is very competitive.