Good point, I did re-read this thread. I know a friend who also got this battery a little after I did and kept it. I told him about my extra time, and he approximately did get 1hr extra over stock as well. He's had it now for a month, and he says the time now is equivalent to stock (i.e. the extra hour does not seem to take hold anymore).
At any rate, with a spotty experience it is hard to justify over just buying a stock Samsung battery if you need the extra capacity. I don't mind losing the NFC over extra battery time, but the results are negligible at best.