I bought one in February, the day my dealer got their first 2. They use the other as a demo unit, and ordered more the day after I bought and they had a chance to listen to theirs with more speakers and time. They weren't able to get more until about 4 weeks ago!
This unit has proven itself to be everything I needed for my 10'x12' office, paired with KEF LS50's and Kube 10b. I've got it connected directly to my router via Ethernet, though when I demo'd it for a friend it connected to his wireless network without issue.
The first thing I noticed is that the volume control is logarithmic rather than linear, as the Bluesound Powernode 2 it replaced had. It's not capable of ear-splitting volume, though drives the LS50's much louder than I could ever tolerate.
Some users have complained that they forgot to add a headphone output. I don't think the box has room for a separate headphone amp and the port would have to be on the inconvenient back or spoil the look of that cool front panel. I don't need one anyhow.
I know this is Audioholics and will get grief for saying it, but still I think this amp sounds really sweet and better than the Powernode 2. It's probably mostly due to the ESS Sabre 9028 DAC versus the Powernode 2's Burr-Brown PCM5122.
There are many great features I love, but chief among them I'd say the configurable front screen and options are the most useful. I can even check the temperature of each channel's amp.
I love this little box!