So it's been about 10 days with the Nagra Ref DAC. It has changed some, more of everything. I don't know if breakin is complete or not. Also I am still using Transparent Ultra Balanced Interconnects vs my Magnum Opus (back to mfg for calibration). The cable downgrade is a big deal for Transparent users. So I know the cabling right now I am loosing resolution, bass, lots of spatial info, over all enjoyability.
That said. I love this dac - and all of these comments are with the cable downgrade. MUCH more spacious, speakers melt away. The instruments seem to occupy their own space better, little noises are more revealing in live recordings. The music, each and every note, has more energy, more weight, more resolution. It draws you in like I've never experienced before.
I can't wait until my Magnum Opus interconnects come back. Guessing a week or two from now. I've also heard that this DAC sounds better single ended which I have yet to try.
It's been a wonderful week or so listening !