I don't run all the technical tests that some users do with micro SD cards, but I installed a SanDisk 64GB Extreme Micro SD card on my new Samsung Galaxy Note Edge and it never misses beat! Contacts failed but I don't think it has anything to do with the SD card. Edge is much better and faster, although I have more apps on Edge than Note IV which is another story! The Note IV works with a 64GB Ultra Micro SD card, which is fine, but the Note IV I have has issues. Little volume. Contacts keep breaking off. It doesn't sync contacts from email addresses properly and among other things it loses some of my contacts. However, I had no problems with the SD card. I was looking for this version of the SanDisk Extreme SD card 128GB but couldn't find it on Revain. I was so disappointed. I recommend the SanDisk Extreme 64GB Micro SD memory card.
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