Chord DACs .. who has moved across to them from R-2R based DACs ?

Just to add to @jjss49 that, like all DAC architectures, R2R DACs too have their sonic variations within the type.  There are tubed and non-tubed, and oversampling and NOS types, both of which (among other things) can have a significant impact particularly on how detailed or warm the resulting sound is.  The base R2R characteristics as jjss449 describes likely hold throughout the spectrum, but I just wanted to point out if you want a more detailed sound you can still get it with an R2R DAC.  As an example, the Schiit Yggy would definitely be more in the detailed, white wine end of the spectrum versus an SW1X model that’d be more on the softer, fuller, red wine end.  I’d ask jjss if this aligns with his experience because he’s actually had and heard more of these DACs than almost everyone here so IMO he’d be the final arbiter, but I thought delineating the world of R2R DACs a little further might be helpful.  As always, FWIW.