Unusable. Rarely finds my one (only and last) Sonos speaker. If my speaker powers off it takes over a week of being powered on to reappear on the network so I have to use Bluetooth. This app is unusable and the speaker is very close behind it. Edit: to make my speaker work I had to do a factory reset and uninstall the app on my phone. This whole sonos 'system' is atrocious.