It’s a piece of cake to set it up even though there are a few steps. It’s also a semi-official addon by Frenck and I’m much happier with the security implications than using some completely 3rd party service with all the DISCLOSED warnings about that. I’d use ZeroTier One any day in preference to that.
Incidentally, after handshaking it’s a peer to peer link that goes point to point not via the ‘service’ Packets are end-to-end encrypted and can’t be read by roots or anyone else, and use modern 256-bit crypto in ways recommended by the professional cryptographers that created it (from the online manual)