There's not much to say about this product, other than it works perfectly as it should.  I originally bought this for a tablet that had an expansion slot, but I returned that for another tablet without one.  So I thought I didn't have a use for this card anymore, but I was wrong.  It turns out that when you put it in it's full size SD card adapter, it even works perfectly in my Nikon D90 DSLR.  Up until now I had been using a standard 8gb card, which was fine, but 64gb is even better!  I don't do burst shooting, so I can't attest to how quickly it can write, but I noticed no difference in speed between this and the standard card that I had been using.