Never heard of this brand but decided to risk it. When I got them I ran a speed test on them, the 512GB card got 66 writes and 87 reads which is great. I also have a 256gb card and it is 68w/89r. I also fill them with my video files to check space and file readability. I haven't checked every file, but enough to make sure they're correct. If the card works well with some of my other devices I will buy this brand again. I tried the maps in my HiRes audio player and had no problems with the maps. They were fast with both my iMacs and Windows computers.
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