Its a good ad hoc portal. Its needed by some forums and its used by plenty. Its one of the few mods thats extensive, well supported, and not charged for extensively.
This addon was one of the key reasons I switched over from vBulletin 4 over to Xenforo. Xenporta is way better than any CMS system I've ever used... and it's free.
The only replacement for vB Advanced as far as I am concerned. Also the only current 3 column solution which some customers demand. The flexibility with block development is great. The plugin does lack support. But its free and still works.