They had the DAC at Axpona too, both in the headphone area, connected to a Z10E and also one of the 2 channel rooms, connected to a Ultralinear + integrated. I can’t speak for the DAC, as there was no way to compare, but the chain sounded great.
And they were nice enough to allow me to demo my headphones on the Ultralinear +, and I enjoyed the sound of the DAC and amp so much that I bought the amp.