Got one of these and it is awesome. Can I notice the issues talked about in this thread, blooming, banding, stuttering, etc.? Yes. Do they stick out when I'm not looking for them in any way that detracts from my enjoyment of the picture? No.
Unfortunately, the entire panel is bent. Became very apparent when I mounted it on the wall. So I've got another one coming in tomorrow. I noticed there have been other people in this thread with bent panels, so hopefully the next one comes in straight, and it's not a widespread problem.
The TV works fine, and the picture is stunning on HDR material, which is why I wanted the set. This TV actually puts all of those theoretical benefits of HDR into practice in a way that a less bright TV just can't do. Is an OLED a better TV? Yes. But is the quantum a better HDR TV? In my opinion, definitively yes! For the content that stretches beyond the brightness range of an OLED, the quantum permits, dare I say, a transformative experience
I've read elsewhere that hitting 2000 nits reaches a sweet spot in what the human eye expects in a real image, and my experience with this set matches that. So if what you are looking for is not just a great TV, but a whole new kind of watching experience, I'd recommend this set.
For non-HDR content, there is not much difference to me between this set and my old Samsung Plasma, which is a good thing. Viewing angles are, of course, not great, but not much of an issue given my setup.
For cable box content (actually Dish in my case), I've been playing around with the settings and found some interesting things.
The Clear Action setting slightly dims the picture and introduces just a barely perceptible flicker for me, though my wife says she doesn't notice it. Putting Reduce Motion Blur to 1 entirely eliminates the flickering without giving me any noticeable artifacts or SOE, while appearing to retain the Clear Action benefits for motion perception when I'm watching sports. It's funny because I can't tell the difference between 0 and 1 on the Reduce Motion Blur with clear action off, but with clear action on the difference is night and day, I think just because it is eliminating the flicker for me.
I set sharpness to 5 before it starts to introduce noticeable artifacts. I've also tried using the Reduce Block Noise setting, but I think I've decided I generally like it better off, though it does help with some of the channels that come in particularly compressed.
I wish I could use the Auto Brightness Control because the room is not light controlled, but the medium is just a little too dark for my liking most of the time, and the high is way too bright. Setting the Brightness to 10 seems to work pretty well as a compromise for general use throughout the day, a little dim during the day (but brighter than the plasma was), a little bright at night. Just based on my perception, it seems like Medium is probably getting pretty close to the 100 nit spec target in a dark room. It seems like the auto brightness can go dimmer than you can by manually adjusting the Backlight setting to 0.
Finally, a question I haven't been able to figure out about the upcoming Airplay compatibility, that I was hoping someone in the beta could answer. How does it work with movies from iTunes? Can I cast a movie from my iPhone 6 (which doesn't support 4K or HDR) to the TV and have it play 4K and HDR on the TV? Does the movie actually go from my phone to the TV with that content, or does the TV get the content directly from Apple like an apple TV would?