San Francisco, CA
I have been going to Santiam for over 5 years. After moving from Portland, I was worried it would be hard to find a good shop. Turns out Santiam is a better than anything I ever experienced in PDX. This shop has super knowledgeable mechanics who are always willing to go the extra mile, give you plenty of options, and perform high quality work -- all with zero attitutde. Also, the shop is a great source of information for road and mtn bike trails in the area, and also sponsor some rides themselves.
Bottom line --- excellent shop, prices and staff.