Not a fan. The Sonos ‘Home theater’ paradigm is set up for an Arc, up to two Subs, and two surround speakers. Adding a second ‘room’ to that muddies things for home theater use.
 

Now, for playing streaming music, I’m a huge fan, all will be in sync. 

That video, and that setup, are horrible.  First, the sound will either echo, or be out of sync with the video.  Second, it destroys any front soundstage by making the left and right channels doubled and spread out.  And third, that video causes people to think that idiotic setup will actually work.