I wonder how this compares to the Audio-dg NDB-28.38 with the Sabre ES9038Pro . One thing the Audio-dg has going for it is that it accepts balanced and single-ended inputs so you can use it to amplify other sources. And MOAR POWER! Almost 3x. Just look at that R-core transformer and power caps.
http://www.audio-gd.com/Pro/Headphoneamp/NFB28.38/NFB28.38EN.htm
blahhhI own the AudioGD 28.38. Its a good unit, and will drive anything, I cant do a direct comparison with this unit as I don't own it. I have been very happy with my AGD unit. It just takes a while to arrive to the US, and you can use it with powered monitors / external amp.
http://www.audio-gd.com/Pro/Headphoneamp/NFB28.38/NFB28.38EN.htm