An external, higher quality DAC definitely improved my SQ. A Morrow coaxial cable and $150 power cable helped a little.
I've had it set up on cat8, gigabyte ethernet originating from my Google Fiber Switch from day one.... didn't want to compromise the data stream with wifi. I think a good, fast, wired connection is important.
I have Spotify & Tidal and just started a 4 month free trial of Amazon. The Node 2i navigates the different sources very well.
For my modest system and my 66 year old ears, the Node 2i with better DAC is quite satisfying.
Didn't see it mentioned in the discussion yet, but another new feature on the Node is an HDMI-arc input, which is intriguing. The idea of routing TV sound through my main system and outputting to a spare set of speakers at the TV might be an interesting project, since they are in the same room. The arc connection would allow the TV remote to control volume..so no extra remotes or pointing a remote to another part of the room where 2 channel audio resides.