I ordered my 5S right away, got it in and confirmed about 5 minutes after the online store opened. I was originally quoted 1-3 business days to ship, with an estimated delivery date between Monday, Sept 30 and Wednesday, Oct 2.
I got my shipping notice yesterday, the 22nd. So it shipped 0 business days after purchase. The email quoted me a delivery date between Tuesday, Sept 24 and Thursday the 26th. UPS tracking says it is on track to be delivered tomorrow. I find that hard to believe as it just left Korea a few hours ago, but they delivered my 4S in about as much time so maybe it really will show up tomorrow.
All in all I'm pretty happy with the free "standard" shipping. I'd feel like a rube if I paid the $10 extra to get it shipped faster only to have it show up today instead of tomorrow.
The only snag I hit is AT&T's awful shipping policy. They won't let the phone be shipped anywhere other than my billing address. That's my house which is fine, but I was really hoping to have it shipped to my office so I could be sure I was available to sign for the delivery. As it stands, I'm going to have to risk pre-signing and having them leave it on the back deck tomorrow instead. The delivery quote from UPS is 2:15 - 6:15 PM. Hopefully it'll be in that last hour so I can be home to sign for it.