Firefox opening on cold-boot opens in ~15sec and around 5 on subsequent opens. It can run YouTube at 720p fine, but at 1080p it sometimes stutters.
Minecraft without performance mods gets ~15-35FPS, with mods it gets ~60-85FPS.
SuperTuxKart can be played on graphics level 4, but it's super laggy on a few specific tracks (~5-10FPS), so I usually play on level 2, which consistently gets me 50FPS.
OpenTTD runs smooth (solid 60FPS), but for some reason when it hangs, it hangs my entire computer and I have to force restart to get out of it.
Yes, this is my daily driver. The only reason my home directory is clean is because this is a fresh install, I'll mess it up soon lol!
Everything works normally in my experience and their wiki is pretty good. The only thing that might be a pain is that their repos are relatively small compared to something like Fedora or Debian, however this is mostly fixed with Flatpaks. Also, protip, you can tag the testing repo to get more packages that aren't in the normal repos yet.