I for one wouldn't like to see a change to vBulletin and I'd disagree with it being faster. One of the digital TV sites that I visit almost as much as MacNN uses vB for its forums and it is horrendous now. Its so slow and is beginning to look damn ugly.
I like the way that the MacNN boards look, very little clutter and apart from some of the recent issues when there have been problems with either the servers or the ISP I don't feel that the boards are slow.
As for 'feature-packed' - what extra features exactly would vB provide that we don't already have on UBB? Personally I think UBB provides all the features that I could want from a BB package.