My venerable receiver just died so went looking for an easy replacement. Sounds like a decent soundbar for the price, comes with a wireless subwoofer. Cheaper than previous deals (except for very limited clearance stock) with FINALS code. Couldn't find any click and collect stock in metro Melbourne so went with delivery for an extra $10, still only $169.
Apparently there is an issue if you are going to input 4k video by HDMI through the soundbar then to the TV, but I'm just going to connect via optical so shouldn't be an issue.
I'm not sure about the issue regarding the 4K video, but I'd still highly recommend using HDMI and utilizing the Audio Return Channel and the CEC features so you can control the volume using the TV remove. I believe you can still run the 4K video to the TV and then have another HDMI act as the ARC to the soundbar