The Admin is very concerned about messing things up, and is looking to vBulletin because he has been told its "easy to use". I don't think XF is any harder to set up than vBulletin (I've ran vB 3.# in the past, but never used 4.0). Basically the Admin doesn't know much at all about setting up a forum community, and this is a big concern to him.
I'm not sure what the point is in this thread. I guess I'm so slightly thrilled about the forum upgrading to a new forum software, but disappointed that he is thinking vBulletin 4.0.
The forum is currently running Simple Machines Forum v1.1.11; there is no converter ("ease of use") so it looks like I'm out of luck.