An extremely poorly tested, feature-barren app. It's not even able to adequately search for the music files present on the phone - apparently Sonos devs assume that only streaming music from the Internet matters these days, and I get that- but then the untested garbage that is playing local files should simply be trimmed from the app. The lack of TruePlay is of course even worse. There is absolutely zero technical reason for this, and Sonos are gross liars for suggesting otherwise.