So I'm loving the 55" TCL 6 series so far. In fact, I was even pleasantly surprised by the sound range of the built-in speakers that I'm returning the soundbar I had picked up (thinking it would be the same lackluster audio in older flatscreens and monitors). Out of the box I've had to do minimal calibration so far, but the color and contrast for HDR and DV content has been mighty impressive.
Also put a few games through it so far, including God of War, Detroit demo, Horizon Zero Dawn, Gran Turismo Sport, and planning to check out Assassin's Creed Origins later.
So far the only banding I've seen has been on youtube via the PS4. This itself seems to clear up as the video quality catches up, and was mostly when there were large shots of solid color gradients.
I've noticed a tiny bit of clouding when things like the HDR logo itself pops up over pure black, but its not very distracting and I was actively looking for this. The HDR has been wonderful so far.
My main point of reference for HDR are the monitors we use for video production, and various Samsung (MU / NU8000) and Sony TVs that my friends have. It feels comparable to those!
Wacky. Shame I didn't commit to making a "first impressions" video. Would have been fun to put my TV through the works and document it all.