Works wonderfully. I had this sd for over nine months and it is still working great. I had trouble getting it to recognized at first by my S3.Formatting from phone and or generic windows format menu did not resolve this issue so I downloaded EaseUs partition master and formatted and it has been working like charm ever since.Write Speed: 8.4 MB/s @ default cache speed.Read Speed: 37.9 Mb/s @ default cache speed.