Long-time ZeroTier user here. Recently switched to NetBird (self-hosted on a Hetzner VPS) and it’s been seamless so far. DNS functionality is excellent (something ZeroTier lacked), and the access-control model is very well designed. It’s easy to understand what’s going on and to grant one-off access when needed. Only real and very minor gripe is the Android app: I wish it were on F-Droid and a bit more robust, as it sometimes drops when roaming. Nevertheless, congratulations on a fabulous piece of software! I hope it keeps improving :)