I am using the N5ii for almost a week now, and have mixed feelings, to be honest. Just some quick impressions:
POSITIVE:
- Sound: So far really good!
I don`t feel it sounds
significantly better than other DAPs in this price range that I have used, so I would not call it "particularly spectacular" (but which one is? Recently they all sound good)

... For sure the sound is very articulated, precise and clear .... a little bit more on the analytical than musical side (depending on your liking)....
Very nice in total and well worth the money and title "high quality audio player"!
- Design & feel: I feel the i5-Design (which I still found a bit cheesy with it`s strange engraved lines) finally got mature! The N5ii looks and feels simply outstanding!! I love the industrial look, the simplicity (even the high res sticker is "optional"!) , the small footprint, the individual back side with it`s zen like graphics...this is close to perfect in my opinion and exactly the kind of design and physical dimensions I was looking for a long time (at least at this price point)!
- I like the idea that the third party apps are somehow hidden and that there are no default Google Apps etc. You can really concentrate on the function as music player and only download the stuff that you really need!
NEGATIVE:
- The quick start guide is - sorry for saying it like that - terrible!! Cayin, please rethink and rewrite it! When I first switched the device on, it took me almost an hour and some postings in this forum to find out how to switch on Wifi! Why? Because the "Audio Priority Mode" is switched on by defaut and it IS NOT EVEN MENTIONED in the quick start guide (nor can be found in a VISIBLE menue)! How should you know that it exists? Since the OS does not even look close to android - I think I am not the only one that did not have the idea straight away to swipe down the HIDDEN top bar, to find the only way to switch it off and switch on Wifi! Just to name one problem....
- My device had the first version of the firmware installed and it did not come with the Google Play Store!! It took me quite a while until I found out I HAVE to update to a newer version of the firmware first and then finally had the Playstore installed! Nothing mentioned in the quick start guide, too!
- This device does not work well at all with streaming apps! I am hearing some weird beeping noises when I stream, the download performance is sooo slow and sometimes completely stops, streaming generally stotters and it takes ages to change the title....especially with Apple Music it`s almost unusable....I cannot even use the physical buttons with it when the screen is switched off!
- The Android EQ that was implemented in Spotify and Apple Music can not be used and seems to be somehow taken out!
- The device freezes and restarts on a regular base...not nice.
- Screen: As mentioned by others: It`s definitely on the darker side and the viewing angles are bad for current standards. Would be fine for me though, since this is a music player .... but what I find a bit more problematic is that the touch screen sometimes reacts with quite a delay!
So as I said...my feelings are mixed. I was hoping to have finally found a DAP in a perfect size for me that I can also use for streaming....but it does not seem to be the right one....hmmmm?