I don't think it's necessary, but I'll check it out. I just got my iPhone 4S last week and have been keeping track of battery usage times and battery charge times just for my own interest. In the four times I've kept track I've gotten:
1) 63% charge in 60 minutes (9% --> 72%)
2) 64% charge in 60 minutes (22% --> 86%)
3) 59% charge in 60 minutes (37% --> 96%)
4) 47% charge in 60 minutes (50% --> 97%)
I think 1%/min is amazing. How much faster can it charge?