I recently came into possession of one of these Pro8 Docking Stations and I wanted to share that this device does in fact work in Linux - video, sound, and USB. The only thing I have yet to try is the network port.
This probably has to do with the Pro8 is a USB2.0 device, and DisplayLink offers source code drivers for 2.0 video chips. The Pro8 is listed as having a DL-165 in it.
The dock also works as a multiseat terminal for those who need to use it that way.