This looks interesting! What's the added value over wireguard + openwrt setup?
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I opted for Netbird myself because Headscale's UI felt too basic for me back then. Has that improved over the years probably?
In terms of stability, Netbird has been pretty good for me. I've been using Netbird as the backhaul network for my laptop, phone and inter-site k3s cluster for several years without major issues.
One major downside of Netbird is that its Android client can be quite a battery drainer [1]. (It keeps your fingers warm during winter, though!) As for Tailscale, it offers some neat features like Funnel, which is missing in Netbird, but in my case, covered by DNS and k8s Ingress.