I picked up a WD TV Live Hub this afternoon and have been loading my music files onto it all evening. One glitch I found was that (at least on my home network) the internal hard drive on the Hub does not like having more than one file copied to it at a time. Every time I attempted to click & drag multiple large files to the Hub I would lose the network connection entirely and have to close all of the windows on my PC, go down to my basement, restart the Hub, go back upstairs, and restart the WD Discovery tool. Dragging just one file at a time was no problem though.
That issue aside, I'm happy with it. The GUI is intuitive, and it does what I want it to do: Stream video and decode lossless audio. I have it hooked up to my Yamaha RX-V863 by HDMI for video and 5.1 channel sound, and I have the analog audio outs connected to my Emotiva USP-1 for 2-channel audio.
My God man, he has a 1803!