Installed on my Samsung Tab 3, the memory card has been operating directly with nothing to do plus.59 GB available (not 64GB), but with 16 GB that I have on the internal memory I have enough do. Good write speed in all, I intend to install movies, music and to transfer my work consistent pictures of my Nikon d3100 SLR (where I also have a 32GB Transcend memory card). Will have to see over time if it still holds up, in which case I will change my note. I'll also what not register on the website of the brand to qualify for the lifetime warranty because you must register within one month of purchase to qualify.