Update iPhone system in an Apple store?

Question

This may be a stupid question and/or have been asked before, but I could not find such a thread.
As has just been announced, the new iOS 4 will be available on the 21st of June. Unfortunately, I will start my holiday on the 20th and therefore away from my trusty MBP. I will be in Las Vegas on the 21st though, and I know where I can find the Apple store there. It seems to be possible to update the system from somebody else's computer, as long as I avoid synching anything.
My question: Does anybody know if the nice people in the Apple store will allow complete strangers to walk in and grab an iPhone OS update? (I would ask nicely, of course.)

Answer 1

Probably, but if something goes wrong with the update which requires restoring your iPhone with iTunes, you won't have any of your existing iTunes content including 3rd party apps available.
I suggest waiting to install the update until your computer is available and if not, just be aware of the potential consequences in the event there is a problem.