How about all the others who were able to upgrade or install Xenforo (even if this was in test boards). Seeing people succeed would surely help the others who are unable to make a decision whether or not to purchase Xenforo.
So reply in this thread, if you were able to successfully install/upgrade/import your forums. Also include a link to your websites with the style you are using, so we can check out
Initially, I could not import using Beta 1. But with Beta 2 it was a breeze. I was successful in importing a forum with 55,000 threads, 170 K posts and 17,000 users. Website - http://www.mastispot.com running XenBiz style. (The website is NSFW)