With weeks of listening, though, don't you also run the risk of mistaking the sound "clicking" with "brain burn-in"?
Edit to add: Also, totally true. Musical genres will affect the headphones and amp pairings. Spot on.
It's definitely a kind of brain burn-in. Rob Watts' theory is that we're used to listening to music out of digital gear with screwed-up timing, so it has to get used to reproduction with proper timing again. I do find most other DACs sound rather artificial now.
Many thing it's a bit over priced, but that is neither here nor there.
On the contrary, many people who are not Redditors or close friends with competing manufacturers think it is worth more. I have taken it into Hi-Fi retailers who have never seen it before, hooked it up to their high-end systems and asked how much they think it costs. None gave below 4 figures.
Audio-gd did update the NFB-11 recently, so I've had it in mind to compare how it would go.