I'm running EndeavourOS on a little Ryzen box I got for a desktop. It's fine. They have their own mirrors hosting some different core packages than base Arch, and it seems pretty stable. I haven't had any issues other than some missing PGP keys once.
That said: I've been using Arch-based distros for a while - I have a half dozen different servers running Arch, and a laptop running Artix. After installation, I haven't used any EndeavourOS tooling. I do most maintenance from the command line, and I use a tiling window manager. So my experience doesn't really stress test the EneavourOS configuration, or any of the tooling it provides.
TLDR; It's stable enough.