In my limited experience much of the sync issues with

A few notes:I didn't hook up a sound bar (seems others have sync issues there.

I used the eARC for HDMI to my Blu-ray player with no issues, and used optical cable to connect my 5.1 surround sound system with no syncing issues or lag

This TV has some pretty nasty and annoying bugs that might be potential deal breakers in the long run such as broken 24hz playback due to lip sync issues, TV randomly crashing for no reason, fairly glitchy HDMI inputs where the picture would be blinking non-stop no matter what HDMI cable you're using, and (more rare than others

Then audio sync issues started no matter what I watch on it

Also the motion is now not as great as I once thought it was because of fairly choppy panning shot and when motion interpolation is activated it produces too many nasty artifacts

Picture is fantastic and not as bright as I