i will try to find some time to listen to the GG DAC, but not right now. I have come to appreciate some of the later generation digital: Stahl Tek, Metronome, Boulder 2000 series and Vivaldi in particular.
I have enjoyed my Zanden for 7 years now and counting...with no desire to change though i have thought about a few digital pieces from time to time. Metronome and Stahl-Tek had me thinking for a little while. The Zanden requires a little TLC on tubes and a lot of TLC on isolation from vibration (above and below), but 'thats me done' once i completed these tweaks.