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It works as it should. It is much slower than the Samsung microSDHC rated the same speed when using Blackmagic Disk Speed Test. Less than half as fast, in fact. And in real-world conditions, it's not twice as long to move files; but, it is noticeably slower. Worth the money, but does not compare to same rated Samsung--get Samsung on sale for a better value, IMO.
SUpposed to be 32 gig. they are 'close' to 32 gig. Some are actually different than others. Doesn't matter for recording, but for copying disk images, really bad, because they MUST have room to fit the image.
This product looked like the perfect purchase to put in my Roku devices so i can store more channels without Roku having to reload them. I tried the Amplim SD card in 3 of my Rokus (i have 6) and Roku could not format them. I haven't tried them in any other devices like cell phones but just thought i should pass along my experience.