I wanted a system that would keep users on the frontend but give them the option to enter articles using particular fields in a very simple manner. Cobalt achieved this, I did have to go through some documentation but it was all worth it.
I asked on the support forum about a feature and they had it ready in the next build a couple of days away - I don't know if it was planned or not but it felt really professional. I was also able to find a Russian translation (still to be installed).
The team was very helpful with several queries. 10/10, and it's free!