I got this to connect a 4 bay eSATA external box as it supports Port Multiplying.
The driver disk that comes with it seems to be generic for a lot of products as well as this card although the instructions do tell you which drivers to use it is not immediately clear as the naming does not seem to relate to the card, if you are not sure then you can download the drivers from Startech's web site.
If you are using this for external devices then make sure you move the block of jumpers over as detailed, it is set as default to use the internal connector, and remember this card only supports 1 port, either the internal or the external.
Slotted it into the PC, loaded the correct divers and plugged in my external box, a brief period of blue flashing drive lights from the box and then all the drives recognised OK.
So all in all it does what it says with no drama.