Cards appear reliable and run about as fast as ProGrade claims, but the write speed difference between 128GB and 256GB card models is 20%. Not all SD cards are the same, but there is one big difference. Bought a 256GB version card, counted on the same write speed, got something much lower. I don't have the 64GB version so can't comment on that, but be aware that you can get wildly different speeds if you order one card over another. The first photo is 128 GB, the second 256.
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