After turning the sandisk barely cheaper, these cards are really better. In use in a reflex, I can continue to take about one picture per second once the full buffer. I have no USB3 to test the actual flow rates, but knowing that my RAW are at least 25 MB, we can assume a minimum write speed of about 20 to 30 MB / s, which suits me! One star less for the (no) package: completely bare board (I chose the standard package and not unpack Frustration-Free), not even a plastic box provided. This is a detail but it would remain useful for moving these cards.