I bought this card for my EVO 4G in order to speed up file transfers as well as boost its storage capacity. As others have observed, this card is really fast. When I place my phone is USB mass storage mode I can transfer music photos and movies incredibly fast between my phone and my computer. It seems way faster than when I had my iPhone. So far I have had 0 errors which have arised from my SD card. Fully compatible with an EVO 4G as far as I can tell. 

Question: What's the amazing card?
Answer: I bought this card for my EVO 4 G