How about we make this a little better. It's a bigger change but it seems like it's a long due change:
1) Change review to have a reviewer which is a Reviewer instance
2) In Reviewer, delegate the methods such as name and all to user using Forwardable (def_delegators :user, :first_name, :last_name etc.)
3) In user, change actual_reviewer to become reviewer_for(conference) which is really just a scope call to Reviewer.for_user_and_conference(user, conference).
4) In factories.rb, change the association in review to be a reviewer association which will create a user if needed and all should work without a weird lonely create call.

Makes sense? If not, we can get together on skype/hangout and pair on it.