Not heard either (have a unitiqute2 with Leema xero speakers). But the muso is meant to be a step above sonos in sound quality. Though if you wanted 2 speakers what about the kef LSX?
My 2p would be to obviously hear the NAD and hear other streamers/amps too. I presume you are listening to decent quality files? Tidal/Qobuz/flac etc.
The darko website is quite good to see what’s out there even if you view reviews as just an outline/indication or to put a list of possibles together that you would like to audition.