I'm delighted to have found this extension and it's well worth the money. You can create draft versions, preview them then either publish them or fall back on previous drafts. I had a small support request about drafts not being deleted when the original article was deleted and received personal communication about it with the promise of a plugin to provide this functionality. I understand they are working on some more extensions, so I shall certainly keep a close eye on them. Well done!
Takes Joomla up another notch
Published in Real Preview Reviews