I returned the iphone 5 today and went back to using my 4 with OS5. I'm saving my upgrade for the 5s. By then there will hopefully be cases, adapters and a google map app available.
In the meantime I'm using the money to get a dedicated gps.
Fyi, AT&T wanted to charge me a $35 restock fee so I talked to the manager and he gave me a credit.
Less battery time, crappy wifi performance, apple maps .... Just seemed like a downgrade from what I already have.