Well there's good news and bad news. The Concept 20s have arrived and sound superb: clear, taut, smooth, with great performer presence. I'm still running them of course, but at this point I'm quite sure they're keepers.
The bad news: the CCA also arrived but I'm having a devil of job playing Apple Music through it via Airplay. It's driving me nuts, tbh. Perhaps I'm missing something obvious? Sometimes it seems to drop the Wifi, and even when it's properly connected I get asked for an 'Airplay code' (no idea what that is). So as of right now have not succeeded in casting anything from Apple Music.
Luckily I have also sourced a s/h Yamaha WXAD-10 but won't get it for another three weeks so I suppose I have to be patient a while yet. Two steps forward, one step back.