Although the data transfer from the internal SSD to a extere SSD or USB flash drive utilizes (ExpressCard inherently) USB3.0 not fully out yet, it is a significant gain compared to USB2.0 (I have my ever 180 Mb / s get displayed )
The only downer: The card is quite loose in the shaft, the USB3.0 plug it very well in the sockets => You need the card to hold, so that one really pulls the plug.