http://www.hana-lab.com
There's a new review which just came out in TNT Audio, and I'm glad to say it's very positive

Here's the review with some photos:
http://www.tnt-audio.com/ampli/hana_lab ... amp_e.html
It's a RasPi (B+) with Sabre ESS903 DAC, and the amp is based on TPA3116... I also do monoblock amps, tube preamps, etc...
I've been making these systems in round aluminium enclosures for about two years now - and I'm constantly trying to improve the system

Right now I'm workng on additon of an Arduino to the RasPi server, which would take care of powering the RasPi on and off... It will take some time, though, as I'm actually only learning Arduino....