Does this card work correctly in an EX1r?
 

Panasonic has recently released a new SDXC card with claimed download speed of 90MB per second. It's full, amazingly cumbersome name is -

Panasonic Gold RP-SDU64GE1K 64 GB Secure Digital Extended Capacity (SDXC) - UHS Class 1

Does this card work correctly in an EX1r?

Yes, I admit it. I use MxR adapter cards. Three years now with no failures.
Downloading at the speed of an SxS card in an ExpressCard slot sounds good though.
And, no. I don't have any ExpressCard slots either.
There are a couple of SDXC to USB 3.0 readers available that claim to read 90MB/s.
And, again, no. I have not yet added a USB 3.0 card to the MacPro.