Ugh. Concourse is interesting for sure, but really hard to get a hang for. I would be careful who I recommend it to.

I don't like to speak in negatives so I won't elaborate, but basically I've had a very hard time using it and it made work miserable. Besides the shiny UI, there was literally nothing to make a devops team's work easier. Simply accessing a failed job log output was hard.

I prefer gitlab-ci because I already use gitlab and the integration is nice. For a pure CI system I would use drone.io if I was not already using gitlab.