I don't know about the book quality and I don't know about the multi-hundreds of thousands $$$ analog sound kits. Well I know some and wasn't impressed, which doesn't mean there isn't some holy grail somewhere.
What I know, regardless of what headphone I used on the Pono and on NYA website, which I pay for listening or how I connect this to my larger hifi kit in the living room. It's nothing like NY wants to make me believe, although it doesn't hurt like some others either.
NY's message is cool, his efforts honest, I believe. But he always mixes things up things, especially if you listen and try to stay objective and validate the "facts" stated or referenced facts behind the statement.
I concluded to like him as a musician and accept a little bit of his preacher thingy he has going. But it has nothing to do with the real facts. too much voodoo, snoberism and stubbornness in it.
His offers aren't as great as he claims, nor are the "bad" things as bad. It's all a bit artistically exaggerated.
My (maybe not yours and I'm not saying this because I'm on this audiophilistic analog site) best personal, not scientific, sound experience moments I have had was listening to old gear type kits from the 60s and re-created "old quality listening kit on improved technology" late 90s. All key moments came from old vinyl recordings, some even dirty, as I was too lazy to clean them. No I don't love cracks, dust and noise or warm valve tube fluppy stinking sock quality music play and I never loved tape for that same overcoloring manner beyond the slight personal "color" layer that I may accept or love, kitsch is kitsch, instead I prefer sound as is sound, bar's, rock, wood, wine...
None of that can be found on NYA or on my Pono. I often even get a feeling as if an MP3 has been treated and upsampled to pseudo HighRez on NYA. But there are far worse, so I use them still. Heck, I paid for it (mobility reason, for when I'm not at home, juggling black memory media).
cheers,
Carlos.