Nice write-up!
My one question: what do you mean when you write USB DAC mode doesn’t work with Android? I do use the N3Pro wired to my Android phone (a 2020 Asus unit).

Thank you.
I didn't manage to make it work with my Redmi Note 9 pro nor my tablet
It is charging my phone!

I have even tried with various cables.
Sometimes is recognized as dac but I get frequent restarts.
If it works it random and not something well implemented.

Yes it’s pretty much impossible to achieve reliably with just the N3Pro and a phone, I remember now. I believe it is due to the way Android handles USB out. I got a little hub that is engineered to send charging current and data one way, this way it works without issue - needless to say it’s starting to look like quite the sandwich with an external battery, a phone, a hub, a DAP and the three cables to bind them all!

I often get annoying little pops with BT transmission, no matter the codec. I still use the N3Pro as an LDAC receiver when I’m out, as it’s not too distracting, it’s mostly when a song starts or is about to end, buffering maybe.

"Doesn't support streaming services" - this is the reason I haven't picked up the Cayin N3Pro yet, as I live on the Tidal / AMHD Streaming services.

Thank you for taking the time to write up the nice review @Ichos

Thank you.
Keep in mind that as I have already mentioned LDAC is really good so you can stream from your phone.

No Android OS is a pro for me!