Colin loaned me a Nagomi pc 2 weeks ago. I tried it first feeding the Puritan per his suggestion, but I did not really hear much change. More anticipatory excitement telling me I would hear something. But I don't think there was much there there.
Then I tried it in a (crazy) daisy chain arrangement to my amp inside an Elrod string and it really made a nice improvement. See my system thread and you'll see my crazy experiment where I was bypassing a 27 foot Anticable pc with 3 power cables daisy chained together. I used IEC to male plug adapters to tie two Elrods and a Tara Labs into a long power cable to see what would happen.
That combo was pretty good but when I added a third Elrod in place of the Tara, it was too much bass and fuzzy highs. I pulled the Nagomi off the Puritan, placed my NRG on the Puritan as before, and set the Nagomi in-between both Elrods and it was magic. It's crazy, but the Nagomi tightened up the bass, clarified the top end, and made it very musical.
I still need greater than 5 meters to get from rack to amp even if I pull the amp in more, so I'm considering two 3 meter Nagomis instead of a custom length because I did not knowingly suffer any loss of signal with the adapters.
I can now try the Nagomi on the dac or preamp if I can adequately substitute for it in the Elrod string from my back-up pile of pc's.
Hard to explain, but the sound really changed with the Tara or Nagomi in that string of Elrod cables. Enough to give me some taste for what this cable is supposed to deliver anyways.
More cable fun coming as I also have a Harmonix Studio Master and a Sablon Robusto to try. I suspect the Studio Master to have similar Nagomi traits.
Thanks to Colin for the loan. He's gonna cost me some real money here soon as I also want to audition the Sternklang speaker cables.