I bought the 32GB version for my Galaxy S2 and it works perfectly! Read and write speeds are excellent. Since I like Custom ROM's FLASHE on my S2, I always make a backup of my system (CWM backup via recovery) on this card. This is now lightning fast! Previously I had an 8 GB Class 2 card in it, which has unfortunately now completely given up the ghost, and with the card went the creeping slowly. Out of the box to the laptop so and music draufziehen ... with Ubuntu (Linux) and the internal card reader of my laptop I reached write speeds of up to 11 MB / s with an average of 7 MB file size. Can this memory card only to anyone!