Still needs a cert. I get a warning every time I log in.
Still beta, but very stable and ready for production apart from a plugin to integrate Fusion Voice MWI updates to work correctly. We're working on it now but it is taking a little longer than expected to wrap up (and quite a bit longer to get to it in the first place.) Once it is finished, we'll start the migration.
Otherwise, beyond the SSL certificate key mismatch (functionally cosmetic) there's nothing wrong with using it now. As far as the cert error that the other poster mentions, you should be able to store the exception permanently in your client.