Eh, that is only part of it, my comments were referring to genuine MicroSD cards, essentially Samsung's Evo cards are made using flash from their semiconductor

Eh, that is only part of it, my comments were referring to genuine MicroSD cards, essentially Samsung's Evo cards are made using flash from their semiconductor fabs, and tend to have higher quality over Sandisk and basically all others since they buy random lots of flash off the open market. That being said, Samsung isn't performance testing each microsd card, so you need to bench them ASAP when you get them to make sure your getting above 2MB/s in random I/O and around 20MB/s in write speed. If they fail that test (which if your buying more than one, you'll run across), just get it exchanged with the seller, no reason to hang onto a poorly performing card.