I may have mentioned this before, but its just so smooth and efficient, its worth repeating. I was on my way to an event and wanted to pick up a leather case for my new iPhone. So I stopped by the Apple Store, and this was the process:

1. Walked to back of store and picked up case from the wall display
2. Opened Apple Store app,and scanned bar code
3. Entered password and Credit Card CVC code
4. Walked out with my new case

Elapsed time, less than a minute. I believe walking the length of the store was the longest part.