While the class 10 speed is excellent (it's amazing when files will initially transfer at 200MB/s before settling down to ~19), you do need to use a reader with proper SDXC support, and manually format the card in a good partitioning program, like minitools or easeus. That alone should disqualify it from 5 stars, for lack of user-friendliness. But if it weren't for that, the fast, roomy card is a wonder to own.