Summary: I bought two of these for tablet computers running Android systems. They have performed flawlessly since I bought them a month ago and I see no reason why they will not continue to do so. Other Micro SD's sell for significantly more than these, but there appears to be no difference in performance.
Summary: I bought this memory card for my Samsung Galaxy S4 phone. It substantially increased the storage I now have on the phone. The card was working as soon as I installed it in my phone. I've had it for a while now without any problems.