i just got my WiiM Pro a couple of days ago. it's a very impressive value for money streamer. got it connected to SMSL SU1 DAC, so sound wise it should sound just as good (or even better) as a Pro Plus.
a couple of quirks - app on Android interface is a bit buggy - most of the time when i click the cog wheel on the device name to get into its settings, it behaves as i clicked in the middle and brings back the now playing screen. happens to me all the time, maybe it's a mobile device specific thing.
streaming using Chromecast from Symfonium app connected to my Navidrome server works very well (as long as the server has valid SSL certificate, but that's a whole different story), and I get native CC controls of track forward/back , which is fantastic specially when using the WiiM's remote. gapless playback doesn't work (for me) when using Chromecast casting , does work with DLNA (can't skip tracks with DLNA though) - but i understand this is a known issue with CC .
also just noticed gapless playback doesn't work if i stream local files from my phone through the WiiM app..? very strange
Tidal integration is "annoyingly" perfect.. I'm not keeping my Tidal subscription though (rather buy digital music on Bandcamp)