D3TH5150
I got this not for the space but the speed.  Class 4 is ok, but class 10 is where its at.  Copying files, scanning the card, cleaning caches, writing files, this thing grinds threw it all like nothing.  Before it would take 2 minutes upon boot of my phone for my old class 4 32GB micro sd card would be done scanning.  With this its 7 seconds.