A lot of the other class 10 micro SD cards that came out seemed to have issues after a year of usage.  This one works great in my Galaxy S3.  I also like the color on the card, so much better than just black! So stylish. (except it's hiding inside the back of my phone)  Maybe I should make a clear window just where the micro SD card is.  So everyone knows I am using the SanDisk Ultra class 10. hmm