I've got the Arc and two book shelf speakers for surround. All in all the sound is "ok". It's no comparison to my Klipsch setup.
My biggest gripe for Sonos is lack of connectivity. No headphone jack.. no output for sub that I ALREADY OWN. Sonos wants to sell something like the Sonos connect to add functionality that should have been there in the first place. For the amount of money that Sonos wants to charge, users would be better off purchasing a real setup such as what I use with the Klipsch speakers. There's really no comparison. So take it as some CC.