I have recently added a beam, 2 ones and a sub to my living room and am very very impressed.  I have a dedicated home theatre in a garage conversion with M&K speakers and SVS subs, so I know what a good system sounds like.  I would say for those that don’t want/can’t have a dedicated room the Sonos gets you close enough without having a large speakers everywhere. My first thought was it would be good for Sonos to allow dual subs to the setup which I see they have now added in recent days. The other was a dedicated surround receiver for 5.1 and above.  This would allow you to connect 5 ones or fives for all channels, could also support proper atoms with in ceilings or ones mounted up there.