I went to the San Francisco store because I was in town for WWDC07, where I had barely signed up at the concierge when someone (one of the Toms working that shift) came by and asked me if I needed help.
Prior to [going to the SF store] I had several issues with my MacBook that I wanted someone to take a look at a few days before I was going to leave LA for SF (trackpad button that didn't quite work, power adapter making funny sounds, sound issues) at the majority of the dozen or so Los Angeles area apple stores within a reasonable driving distance. None of them were able to help me, all of them had appointments available only a couple days in the future, and only at the Century City (closest to where I live) store did a non-genius (wow, so hard to find one of these to talk to too) even bother to try to reply to my questions by saying that everyone was busy with repairs in the back and even though some geniuses seemed to not be doing much, that i had to sign up using the concierge anyway. (yes, for appointment dates in a Los Angeles-area store when I was going to be 500 miles away, despite having explained the situation already and saying it was probably trivial and most likely just needed an exchange...)
What I got in the end from the awesome genius at the SF store was a replaced power adapter and a couple questions answered in under 15 minutes: one minute to figure out the issue and answer my various questions, the rest mostly waiting for something in the system to finish before sending me off. Great service. Now I wish I lived near the san francisco store for near-instant service even when it was pretty crowded.
I miss the days when Glendale was the only store in this area...hell, one of the only stores in the entire world, and I didn't have to use concierge to talk to someone for a trivial exchange or pay for procare to get extra fast service.