I use it every day mate. It's OK but as I said, buggy. The entire app will hang from time to time and the music stops while you wait for it to recover. Grouping rooms, as an example, routinely hangs. I live rurally and my broadband is around 18MB however it is unstable so I may be experiencing something you will never see.
But you rarely actually use Sonos, you spend most of your time in Spotify or Tune In Radio or what ever apps you want to use through Sonos. If you buy a speaker with Bluetooth and have Spotify the only advantage of Sonos is that you can sync rooms more easily, something we virtually never use.