Hi Niels Erik,
We're supporting the beta for production use and consider it safe. We've termed the initial release a beta because it does contain a lot of untested code -- and I'm not referring to technical testing, but more to the redesigned workflow, ONIX generation, etc., which have yet to prove that that the requirements used to implement them are suitable for presses in general. We'll be releasing a minor follow-up (which will be the 1.0) to OMP once enough fixes have accumulated, but as with OJS, we're tracking these for early adopters on our
OMP recommended patches page.
Regards,
Alec Smecher
Public Knowledge Project Team