I purchased this because I had run out of space on my old Samsung micro SDXC UHS-1 Card PRO 64GB Class 10 for Galaxy Note 2 II. That card had followed me from a Note II to a Note 3 to my current Note 4. I was a little concerned about compatibility and reliability because a few years ago tried to save a buck by getting a tier 2 brand card that literally melted down.
This time I took a chance with this non-Samsung card and cannot be more pleased. For one thing, the transfer from my old card to this one did not cause this to get hot. Considering that there was about 29GB involved that was my first indication that this is a well made card.
Another thing is after I transferred the contents to this card (via a card reader), as soon as I popped it into my Note 4, it immediately mounted and everything on the older card was there. I took the time to look for corrupted files, sampled a lot of random music, and checked a few videos. Zero issues and the Note 4 did not balk at this card or any of the files on it.
As for speed, I am not going to make claims one way or the other. I did not test it with benchmarking software, and since I use this mainly for streaming music the additional speed (if any) is not noticeable anyway. What is noticeable is the total compatibility with my Note 4 and the extra breathing room the capacity provides me.
Overall I am not only pleased, I feel as though this card is a better value than the Samsung brand cards that I had been purchasing. And every bit as reliable too.