hey toby, see my previous post excerpt
One difference between these stores, and the ones to come and say your local Apple service agent (Mac 1 for example) is that they will stock most parts (if not all) on site, no ordering and waiting for a part to ship. The San Fran store for example has an average 45 minute turn around on all warranty repairs (you can't beat that).
An Apple genius also has the authority to replace an under WTY Mac on the spot if they so decide with a new unit regardless of model, say where it may make an irate customer "happy" or where say a certain part is on back order, the list does go on and they do have a mantra believe me (make sure you get apple care!).
I could probably say more but I won't but a few people seem to have this "whatever" attitude toward apple building these stores here, it's really quite simple, they'll provide second to none customer service and support, back it up with their product and continue to grow, well at least that's the plan.
cheers..