The one here is still pristine, no dead pixels, no burn in. We do use it as a PC display, but that PC is usually remoted in, rather than used directly. So usually not used for display high brightness, etc stuff. Normally used for the occasional news and for the occasional movie in UHD+HDR/Dolby Vision so it would hit higher brightness then, but the changing scenese means we're not worried about a particular spot on the burning in more than the rest.
Yeah while i don't watch the News that often I may sometimes have it on while I do stuff indoors and it's mainly that white static border at the bottom that is the main concern along with their bloody logos but was honestly surprised to see it had burnt in from that rather than say a riva overlay which I normally have up in the top left on every game I play while as mentioned at most TV will be watched for an hour or so ... annoying but at least it's getting sorted for free

Yeah still have mine from 2020 launch. Still going strong.
I don't particularly consider a TV Ive owned for about 4 1/2 years old though, despite how many editions have released since.
Oh I wouldn't class it as old either and still extremely happy with the picture it provides ( bright enough for me tbh ) just like phones these things are upgraded yearly with small improvements each year so from year to year not going to see massive jumps in quality but I imagine we would notice the difference if we used one of the newer set weather that is from games being smoother from the high refresh or the picture just being more punchy due the the Evo panels now used ... would also notice the dent in the wallet/ bank account unfortunately ( when shopping for 77" + )
