Very well. It's not even 150 hrs yet, so the DAC has a ways to go. At this point I don't have any downstream amps attached yet. That will come after this amp section burns in.
But at the moment the sound is quite good. Of course hard to distinguish the DAC from the amp when both used together, but so far, the DAC sounds like a solid NOS design, and the amp sounds just like other Audio GD AIO's I've heard w/single-ended amps--that is to say, clean, clear, powerful, slightly warm, excellent bass, a real get-out-of-the-way amp. Was doing some listening last night via my 5-yr old but still very nice sounding Fidelio X2s and really liked what I heard.
After 3 full weeks burn-in (the 2nd & 3rd of which will have other amps attached to the dual RCA outputs), I'll bring this unit into into the desktop system in place of the MHDT Labs Orchid (at least temporarily/for evaluation); then into the side system in place of the Audio GD DAC-19. I'm expecting the R2R-11 MKII to be at least competitive in the main system; and to be the boss in the side system.