Update since I use Qobuz Connect: when using this stream with hi-res music, the synchronization between my two devices fails when going to the next track of a playlist. Workaround is now to pause music, disable and enable multiroom mode again, then restart the music. The official solution from support, the reconnecting of the decives on a restarted Wifi network, with a certain waiting time, is also a workaround, but not a definite solution. So my rating goes down to 4 stars.
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The app has a complete set of functions and is very well integrated with my two devices (NAD + Bluesound). Hi-res available in multi room mode on both devices. No gaps when playing albums. I enjoy it every day. Thanks for the excellent work!