And then camp 2 posts "don't do it, they did fist me!".

Can you elaborate on more complicated? I get that a customer would need to use two Apps (control system & Sonos) or the controller (touchpad or remote) and then switch to the Sonos App for music selection. With a Matrix I'm assuming 1 Sonos connect per household member. So they just choose their own name, etc for music playback.

Is there more?

Your dealer is wrong. They need to configure the Sonos to auto switch based on tv source and configure room end points properly. They also should go to Settings - Room Settings - Playbar - Then there are two preset settings that have to do with volume control. Deactivate those. Turn the room off and on again, and it should work.

Just to clarify, it was through a Sonos amp feeding ceiling speakers not a playbar. There was no configuration that we could come up with to get the TV sound through the speakers wth the new driver, unless someone has any other recommendation.

Actually, your dealer and tweeterguy are both correct. Problem lies within a lack of discreet input ( aux ) switching command in new driver. Yes, you can set up your Sonos amp as tweeterguy described it in his post, however the moment you decide to listen to Sonos music while TV is on, " auto " sensing/switching goes out the window. You will not be able to switch back to TV ( using C4 remote ) unless you shut system off first, or use Sonos app to force aux input.
Despite the warnings, I am still using " unofficial " C4 Sonos drivers. I ( want to ) believe that sooner rather than later endorsed driver will have some basic additional functionality - i.e input switching.

My understanding is that Spotify will "break" for all un-endorsed Sonos integrations some time in April. By 2018, integration in its entirety will break for all non-partners. Sonos is going to change up the UPnP communication protocols.

I believe Elan is now an official partner, btw.

Sorry, didn't read through the whole thread. I know there was at least on "F U Julie" in there.