Gordy and I had a great time listening to my system a couple weekends ago, time flys. He brought along the traveling Altmann DAC which we paired with my OPPO HD970 through a VH Audio coax digital cable. The Altmann DAC is everything that's been claimed, a rich, full analog like presentation on all the CD's we listened to.
Tonally, the Altmann was very similiar to my APL modified Pioneer 563A, but a bit more fuller sounding. The soundstage was also deeper and a bit wider, with better separation of individual instruments on large orchestral pieces of music.
I'd say the APL modded Pioneer gets me 90% of the Altmann DAC, which suits me just fine

I'VE PUT THIS ON THE ALTMANN DAC REVIEW THREAD!!!
Gordy may also want to chime in with his observations.
NB