Update (2022): has somehow deteriorated since previous review! Doesn't recognise when devices are playing; basically you can't use this app to control audio on Nest devices now (speaker or hub). 2021: Thoroughly unreliable. Speaker groups regularly disappear. Routines do not run. Connected services randomly disconnect. Audio won't stream (constantly replies "Something went wrong, please try again later."). Has been deteriorating since the start of 2021.