No sync issues with mine plugged into samsung tv via hdmi arc. Cant compare with other soundbars or surround systems but the voice control option on this is great as I am admittedly a deaf git, can now hear every word of dialogue. Using less than a quarter of the volume on movies as its loud enough.
On the tv,you can also adjust the sync on the sound settings,apologies if you’ve already tried this as well
You can only delay the audio, but the issue is that the audio is behind the video
You can adjust the sync using the Sonos app on any Apple device,possibly on the android app as well but I’m not too sure on that
£375 seems more than what it usually costs... how did these prices spike so much during covid 19, I could find these for a constant £299 good offers would go even lower.