I can just pitch in here… having 3x NAD CI580v2 and have had PLENTY of issues with them.
You can read more here:
Currently they work “OK” as long as I don’'t use Roon Zone Grouping (I have to group their zones in BlueOS) and also not mix them with other Roon-devices, because they have delay in their playback making room grouping not work great.
I have had tons of support threads with Bluesound/NAD but to no avail. They don’t seem interested in actually adressing these issues with Roon, or they simply consider Roon users such a small portion of their user base that it’s not worth it… It’s kinda fraudulent markeitng though, as they brand their devices as Roon Ready, which should mean they actually work well, and play in sync with other Roon devices…