My computer is older and doesn't have a slot to read cards. So I guess if I do need a card reader I would essentially be paying $19 for a card reader and an upgrade to class 10 vs a class 6. If I don't need a card reader than I really don't know which one to get. I thought you could connect the phone via usb cable to the usb port on a mac it will read the card the same way it would read an external hard drive. But I have an old OS (Tiger), so I dunno.