It continues to amaze me how we have progressed.  I still recall our first IBM PC with a gigantic 10 MB full height hard drive!  Now, here is this little micro card capable of 64 GB.  I purchased this MicroSDXC to use with a new Microsoft Surface 2 Tablet, the 32 GB version.  Since the OS and installed software and apps reduced the storage capability to roughly 20-something GB, perhaps a little less, this little card was an ideal choice.  I have several other SanDisk cards and have never had a problem.  This one is used for all Office files, email, photos and videos from my camera.  I would buy it again and will, no doubt, get another as well as recommending this 64GB Ultra MicroSDXC Class 10 Memory Card.