Hmmm, I've got one that's really, really good. Let me go and check it's name.....
....Oh, yeah - Lexar USB3

Which is why I bought one but little did I know that there are 2 versions... 307 is UDMA7, the 300 is not(but can be through firmware) even though I bought it not many moons ago it was not UDMA7... . It seems to be cards which are 800x or faster and so far I have only heard complaints from people shooting 1Dx or 7DII and only Lexar cards.

