I recently took the plunge in a couple of my CI pipelines and had little trouble. The only thing that actually broke was that the `--cache-from` option doesn't accept a tag, where it does for docker. Everything else pretty much Just Worked.

That said, my pipelines are fairly simple, as are my Dockerfiles, so...

It shaved significant time off my pipelines, though, not having to wait for a docker-in-docker service to spin up (I use Gitlab with Kubernetes runners).