Bought this for my Android phone (low end), and have to say it's working great. My previous card on this was a Transcend 2Gb card, and this is not only an improvement of space, but of speed as well. Files to and from the computer are moving at great speeds, while the camera (5MP) takes lesser time to click pictures.
Ran SDTools on this. The results :
Write Speed : 5.3 MB/s
Read Speed : 10.7 MB/s
Available space : 3.69 GB