I'm using it on Plasma 6 with AMD graphics and so far it's going good. When I had Nvidia I had issues with electron based applications. Games have been running pretty good regardless of the GPU, though Forza horizon 5 wouldn't launch under Nvidia for some reason.
This isn't 2010 with Android Froyo where you need task manager to kill apps. And lower quality? All this comment needs is something about camera quality and we have a bingo.
If you want you can try Floorp if you'd like to use Firefox based browser. It is really customizable, although it is missing a lot of things that Vivaldi has, like split screen and tab grouping. But it has an enhanced support for tree style tabs which is a big plus in my opinion.
It also has double sidebars so I can put tabs in one of them instead of the top of the screen and hide the titlebar without having to modify userchrome.css. That's one thing I missed from Vivaldi when I moved to Firefox.
Breathtaking!