I have to agree. Swarm is probably the easiest thing to get going besides the Docker engine itself. Honestly I felt like I might have been missing some step or component when I set up a swarm, because it was just really easy. Then I could start swarm services by making some slight modifications to my pre-existing Docker Compose files. It is very very easy.

And also runs very stable. It's not perfect, but I've certainly run into fewer bugs than when I was trying to get Kubernetes set up.

Agree, for quick and easy docker clusters swarm is hard to beat. Although it’s not quite the same as kubernetes or tectonic (swarm needs too many diy things to make it truly useable in more complex setups, with load balancers and what not).