Just for heads up, this seems to mess your DNS by default. At least on my Raspberry Pi OS it rewrote /etc/resolv.conf to point to its own DNS which only knew NetBird hostnames, nothing else.

Fixed this with:

sudo netbird down
sudo cp -f /etc/resolv.conf.original.netbird /etc/resolv.conf
sudo netbird up --disable-dns

Also, pings seem to be consistently about double compared to Tailscale between the same hosts.