I bought the 55” of that model and returned it after 5 days. The HDMI-Arc would not work with my vizio soundbar. I spent 2 hours on the phone with LG, who finally gave up and setup a tech to come the following day. He mess about with it for an hour and spent 2 hours on the phone with support. Final answer was the feature does not work with some manufactures audio equipment.
Returned it and got a Samsung, work right out of the box. I also like the user interface better on Samsung.