I run flynn as a local staging/CI service in our networking closet. It allows us to rapidly try out new apps/services in an environment that approaches production on a couple of machines we had lying around super quickly.

There are still a couple of rough edges, specifically around upgrading and persistence across power failures, which is unlikely in a datacenter, but aside from those things, all in all excellent.

In particular, though, the flynn.io team are particularly excellent in terms of support.