I have a Sonos Beam and in the main I'm very happy. However, like others on here I'm having issues with lynching - i have a Sony Bravia TV, a Sony S380 Blu-ray Player and a Sky Q box (UK).
It is usually okay unless I'm using an HD channel. Changing the slider on the Sonos app does absolutely nothing to fix the lipsynching. I've also tried turning off the imaging processing but still to no avail.