Never heard of this device -- thanks for posting, OP.
Getting two video channels to any PC on a home network (through the router) is a great thing. But that begs the obvious question, why not make it with an HDMI port (for AVR input), and maybe throw in a remote a la the WD streaming player? All it would need then is a little flash memory and, viola! It's a two-channel DVR!
a 1 hour HD show is 6-8GB. you would need a bit more than "a little flash memory"