This is a very fast microSD card compared to the class 4 speeds. It looks nice and it works. I'm not sure what else I can say other than that I have no problems with it and it hasn't died on my yet.It's been about 4 months at least now in my Samsung Galaxy S3. The S3 had a reputation for breaking sandisk sd cards for some reason and it's only randomly unmounted about 3 times but easily remounted with a take out and put back in with maybe a restart on the phone to refresh some apps to see it. I think this is just because the Galaxy S3 tends to get really hot right below the sd card which might damage it a bit. I don't think they put it in a good spot but that has nothing to do with the card itself so just get it if you want a nice sd card.