Airedad
I'm amazed.  I ordered this from Amazon on Tuesday morning, and it arrived with Wednesday's mail.  VERY impressive service from Amazon!As has already been reported, the card formats out to > 59 Gb, and it performs perfectly in my Samsung Galaxy S III (which is also new).  Using two card readers on a fast PC, I transferred everything from my old 16GB card to the new 64 GB card in less time than it took to walk to the kitchen and get a cup of coffee.  So I think the Class 10 rating is correct on the card.Once I have some experience with the card in the phone, I'll benchmark the card and I'll also benchmark operations such as internally backing up my Android phone to the card.  Then I'll update this review with some accurate numerical data.  But in the mean time on first look, the person who said that the S 3 has problems with anything faster than class 6 may not have been correct - a full backup of the phone to the card was significantly faster than the backup with the old 16GB class 6 card.  Again no benchmarks yet but once I have them I'll include them here.Right now I'm very happy with this card and I'm really impressed - both with the card and with the unbelievably quick service from Amazon (and I'm in Atlanta where shipments like this one often take the full 3 days to arrive).