So this is the stable version now I guess.
I'm not subscribed to early access updates.
I've had that notification for ~2 days now.
I'm not in a hurry to perform the upgrade - been looking around here and on https://forum.sailfishos.org/ to see what people have to report.
Nothing here so far?
Some worrying threads on forum.sailfishos, but they all seem to apply to the early access version (3.4.0.22 afaics). Also this one, but it has some interesting info towards the end.

Nevertheless, I'd like to hear how the stable version update went for people (who didn't get the developer update)?

Maybe some tips? Making a backup beforehand is a given.

I'm on Xperia XA2.