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It seems pretty good to me, and easily able to hear the difference between FLAC/Spotify/Qobuz variants of the same song, so I know it's not all bollocks.
However, it's expensive compared to a Chromecast, and the method for finding/playing FLAC files via the Yamaha app on my NAS is fucking awful. Going to experiment with Twonky later to see if it's better.
The Spotify/Qobuz/Tidal integrations are pretty much flawless, and you can turn it on remotely, which is awesome.
Bought a spare chromecast audio as they've stopped making them. Haven't tried the Yamaha you're using @se1derful , how do you like it? I'm in the same boat, old hifi rig(s) that I've added a streaming device to.