* I used this feature when it first came out and found the experience pleasant, and was even prompted to flag down an employee and ask for a bag if I wanted (sure that partly defeats the purpose, but I did it anyway to see what would happen—I received a smile and a bag and a thank you with no hint of suspicion and no double checking of the receipt showing on my phone. I did have to enter the security code from my linked Credit Card.
Very awesome system in that it removes yet another bit of friction from the buying experience. I no longer have to wait for someone to be available to pay for my purchase, I simply pick it up, pay for it using my iTunes account, and leave the store.
I would guess that Diego is about to be out of a job before Christmas :[
Last time I was there I even asked the blueshirt to show me the battery pack/scanner apparatus attached to his phone. It was no big deal and he was happy to talk about it.