I just got back from the store and set up my LG 6K. So far, I am very happy with this display.
It is enormous, and the power supply brick is huge! But setup was very fast with my MacBook Pro M5 Pro. I attached the Thunderbolt cable from my Mac to the monitor, and I attached my TB 4 dock to the monitor, so I still have single cable connectivity. I haven't tried attaching my 27-inch 4K screen as well, as it seems like too much screen.
I already had the BetterDisplay software installed, and perhaps that is why my Logitech keyboard's volume and brightness controls work fine with the display. The sound is better than the MacBook's built-in speakers.
I tried the display in portrait mode and it's very overwhelming and does not seem useful this way. In landscape mode, I could not lower it as much as I'd like, but I can lower my desk (electrically), and so now my desk is quite a bit lower. This is probably better for keyboard use.
I then tested it for the notorious dark edges reported by several. I tried a solid black and a solid white screen. For the most part, the right and left sides are a little darker and it is because of the anti-glare coating, not because of the screen itself. If I move my head and look directly at the sides, the darkening is mitigated quite a lot. The left edge does have some bleeding, and the bottom left corner looks a bit dark. So the screen is not 100 percent perfect, but it's extremely productive for me. Best Buy gave me 15% off for applying for their credit card, so the price was quite good and with their $50 annual club membership, I have 60 days to decide whether to return it. So far, it looks like a keeper and I'm looking forward to putting it through more of its paces.