I've been using it for about 6 months to tie together remote video streaming servers in a star pattern with a vxlan overlay running on top of the wireguard connections. I mostly push low latency video over the connections.
I've only had an issue once which was a bug resulting from some refactoring work, and Jason immediately pounced on it and had a fixed release out within a few hours. Honestly, a project with a maintainer that takes ownership of the code base like that imparts much more cred than any "stable" or "production ready" label does.
-Reuben