oh so translate to vB then translate to xenForo? just a pain then to translate 100k posts rather than losing em all and starting over.....could be worse.
If it doesn't work for whatever reason would it be possible to get my cash back?
I suggest first do as much cleanup as possible in phpbb. Once imported to VBulletin, use VB's excellent backend tools to again streamline the database. Then convert to Xenforo. That way the chances of you facing problems with the actual Xenforo import would be minimal.