It's been fairly stable as I would expect from an LTS. There's LOT of hiccups with whatever is happening in the tray area (power and battery sometimes doesn't work).
Language is pretty screwed up. I speak both English/Spanish in a Spanish location. Installer chooses half spanish and english in the /etc/locale, and has issues changing it in the frontend.
Overall nothing I can't fix as I put stability overall
Yes, you have a new version every half year. That version is supported for 13 months though, so when the release after the next release comes out, you have time to upgrade to the next-old release. If you want a more stable system with more tested packages.
Or you can just upgrade. I already tried Fedora 40 (back then rawhide, as it was not branched) for testing Plasma 6, and it was way better than KDE Neon. It is just so much more stable, Idk why.
I had tons of bugs but those where all plasma bugs which I could report.
It is no issue at all to upgrade, especially on atomic desktops. Like, upgrading Debian 11-12 was scary, upgrading atomic means you end in 1:1 the system they have on their servers (plus your local changes) so they are stable as heck and dont fail. If they fail, you still have your current system.
If you "pin" the current system (sudo ostree admin pin 0) you keep it. So if the upgrade introduces some regressions, you can just choose the older system in GRUB, and you could rpm-ostree rollback to stay there.
Installed KDE Neon today but the whole tray area popup is not working?
Updated everything using pkcon update. After installing everything works fine it just that there's nothing when you try to open things like wife selector or power management features.