I just finished setting up an older forum to run FusionBB. The install of Fusion went perfect without a single hitch.
I then ran the conversion utility included with Fusion to convert the site from UBBT 7.x and it went perfect except for one item. While it recreated the gallery, it did not pull over the images. I'll post that in the bugs forum.
Otherwise it again affirmed my decision to run FusionBB on all four of my sites.