Thought it would be useful to have this thread.
I can personally verify that the SanDisk V-Mate is able to use a 64GB SanDisk Ultra microSDXC w/ SanDisk microSDHC Adapter.
The microSDXC card was formatted using fat32format.exe (freeware) from www.ridgecrop.demon.co.uk
I have not filled up the card yet to verify that all of the card is useable, but I expect that it should be.