I bought the 32GiB version when I learned that the costlier 64GiB version's microSD port only supported 32GB (ie. non-XC) cards. Don't know if it's true, but with removable media I can always upgrade.
I have a 64MB Class 10 microSDXC card in the tablet. I already had some Class 10 64GB full size SDXC cards that I use with my camcorder, and they work fine in the keyboard/dock.
If only it could play back the native 25MB/s AVCHD from my camera. It does play a 1080p30 video at 1.5MB/s H.264 file pretty well though.
Since I'm using my SDXC cards for pro video, I want the highest rated media that I can afford. But it's obvious that the TF700T can't take full advantage of my media. Does anyone know the top class that the TF700T supports? Or a utility that could tell me? Maybe it's somewhere in /proc or /sys. I could see buying a bunch of cheaper cards to save movies, TV shows etc. on.