I love vBulletin 3.x and have refrained from upgrading to version 4. I am genuinely interested in purchasing a XenForo license to give it a try with one of my forums. Keeping that in mind, once I have started to use XenForo, if for any reason I want to switch back to vBulletin 3.x, is there an importer or easy method to do so? Or once I'm XenForo, there is no going back? Thanks in advance.