OCIA.net has posted their review of the Vantec eSATA ExpressCard UGT-ST450CB

Many years ago it was quite common to find notebook computers sporting PCMCIA cards. If you wanted to add a Token Ring, Ethernet or Modem to your laptop, you had to buy a PC Card that plugged into one of the available slots in the side of the chassis. Even after these devices began to become integrated, there would be new technologies emerge that required purchasing an add-in card, although the need for such expandability slowly waned as USB became the popular choice for external peripherals. With the advent of SSD technology and eSATA interfaces, it has become easy to saturate a measly 60MB/s USB 2.0 connection. Obviously a faster method of transfer is needed and USB 3.0 just hasn't materialized as quickly as we hoped. Thus for review today we have the Vantec Dual eSATA ExpressCard.

Vantec eSATA ExpressCard UGT-ST450CB Review