I'd be interested to know how any Android users are finding the app? Reading the reviews on the Play store there seem to be a lot of negative ones. I really like the idea of these but so much is depnedent on how good the app is.
I'd say it depends how you use it.
For us we're heavily invested in Spotify, but even before the Spotify App integration the Sonos app is fine - but you can almost get away with never using it!
Three things that make it work well for us:
1) It's easy to add favorites from any service (like a radio station, of a Spotify playlist)
This way we don't really use the Sonos app to control anything other than switch between those two services. By using the Spotify app on our computers or phones we're updating a playlist that the Sonos speakers will just automatically see the updates to.
2) The hardware "play/pause" button remembers whatever service was used last. So if you get up in the morning and press "play" it either turns the radio back on or picks up where it left off in your Spotify playlist
3) Use an "Alarm" to reset the device. You can create an alarm that comes on in the morning to any service, playlist or favorite. This way the whole system resets. I.e. we have it set so that our Alarm is Radio2 at 7am. That way every day, no matter what we were listening to the night before the whole system resets to Radio2 without us touching the app.
We've got the alarm set to only be on for 2 hours before it automatically turns off, that way we avoid using the app once again before leaving the house for work.
Or, you could avoid using the app simply by pressing the play/pause button as you leave the house.
Again, an alarm could be made that turns on to your favorite Spotify playlist before you get home OR you do what some people do and create a "silent" alarm (zero volume, only on for 30 minutes) that changes to your favorite playlist and when you walk in the door if you press the play button on the device it starts your playlist.
You can also get 3rd party apps like Yonomi that run on your phone and automatically start your Sonos when it connects to your WiFi
The addition of the real Spotify integration works a treat. If you didn't listen to radio and only used Spotify currently then there's zero need to use the Sonos app other than configuration of settings. Something that when you've got it set up to your liking you do only once.
Quick edit: I should clarify that I use the iOS app and everything works "fine". Quickly reading the reviews it sounds like certain features (even like the alarms) are just plain buggy but it also seems like there's not a lot of love for Google Music, which I suppose if you're invested in must be a pain!