I am putting together a document that goes into the status of the various aspects of RCO.
However, I will just mention that it is NOT yet in production status. I am using it as the CMS to run a web site (later.runtime-collective.org), and so far it has proven effective to use and fairly stable behind the scenes. However, there are features missing from each layer that I think need to be added before it's ready to be a version 1.0 release.
My posting here is as much about seeing whether there are people who may be interested in using RCO as an OpenACS module.
Once the status report document is finished I will post a link here.
