We installed the 65" version on our bedroom wall (replacing a 43" FireTV 4 series, which we also had problems with). The only two things we have attached to it are a PS5 and an Xfinity media box.
Overall, I'm torn between giving this tv a 3 or 4 star review, but I'm going with a three for one particular problem: there are times when the very edges of the screen (the top-right, and right side) appear as though the QLED panel is not properly aligned, and you can see long strips (4-8 inches) of the bright white panel showing around the edge of whatever you're watching. It's really only noticeable on dark scenes, and scenes with a lot of light will kind of "blend" the edges back to normal. I'll try to remember to get a photo of this happening, and include it later. It is incredibly distracting when it happens, and for that, I'm dropping a 4 star review down to 3. I'd look into sending it back for a replacement, but I think it may have occurred in transit, so I'm not confident the next one won't also get beat up. When I got home and saw the box on the porch, it was banged up so good that this was actually the first time I've photographed a box in case the packaged product was smashed up. There was no noticeable damage on the tv's exterior, and this problem took a few weeks to present, so I'm thinking there was some internal damage that is getting worse over time. That said, whenever this problem gets bad enough, I'll be replacing this tv with a Samsung, as we've never had an issue with a Samsung tv.
Another big complaint is that there's no way to adjust/calibrate the picture settings when you're on the home screen (meaning the FireTV screen). It only allows you to adjust the backlight, which I currently have at 50% (and even at 50%, I've noticed white characters will have "hot spots" on their faces where the screen is simply too bright, and the actors/actresses look like an off-frame light is reflecting off their faces). I'm so confused as to why you can't calibrate the settings on this screen, but I've scoured the setting screens and there's just nothing I can do about it.
Aside from those two complaints, I actually quite like the TV. We have a Samsung Frame in our living room, and given that this is clearly meant to be a cheaper version of that, I will admit that for the price it's a worthwhile alternative. We put it on the wall on a low-profile Amazon mount, and it really does sit nice and flush, but does still look very much like a tv (unlike our Frame, which has been mistaken for a painting on four separate occasions). The audio is good enough that I don't feel compelled to add a soundbar or Echo device to it; however, I did test an Echo Studio with it, and that was a GREAT upgrade...if this was in my living room, I'd keep the Studio paired to it, without question.
On other inputs (PS5 is on the eARC, and the Xfinity box is on HDMI3) I can adjust the screen settings and calibrate it as necessary, and the picture quality is NOTICEABLY better than the FireTV interface. God of War: Ragnarok on PS5 looks fantastic, and I'm also a computer gamer, so I'm humbly giving credit where it's due on this one. As for the Xfinity box, the increase in picture quality on that input is so noticeable that I've just given up on using the tv's native FireTV interface.
The artwork it displays is really nice, and having it integrated with Alexa and being able to ask about the artwork is a really cool feature that Samsung really missed out on. We only had that feature on for a day or two because, unless I missed it, there's no way to set it to a schedule so it doesn't turn on while you're sleeping...which seems strange since it's an Alexa device, you'd think a scheduling option would be a native feature/option. As it stands, the motion sensors would turn it on if we rolled too much, or got up to pee, or if the dogs or kids came into the room, so we just turned off any and all standby modes.
Overall, I'd say this is a great tv for a secondary watching location. If this was in my living room, I'd be sending it back for a refund, not a replacement. But because this isn't any kind of focal point, we're just living with its flaws and moving on, and accepting that the experience we're getting is not worth what we paid (and we actually got it on the Black Friday sale price).