I'm author of Meshbird. Big different between Tinc and Meshbird. When you start Tinc you have to specify other node addresses. When you start Meshbird you have to specify network secret key only. Meshbird's node will find each others automaticly.
Meshbird is not traditional VPN solution. It's a distributed private networking. Where encrypted packets going directly destination host without passing any gateways. It's avoid performance and availability bottlenecks.