There are currently hundreds of Bulletin Board scripts, of which the majority in PHP alone. One Bulletin Board contains more or other features than another. There is just one 'feature' I see in WowBB that I haven't seen in any other bulletin board, and that is the 'select users by location' feature with a spiffy map. However, it's nothing more than eye candy, and doesn't add any functionality or whatnot.
Furthermore, from a Bulletin Board being claimed professional and which even costs a pretty penny, I would at least expect the Bulletin Board's source code to be written in valid markup languages. In the demos alone, there are already numerious pages or features that either don't work or just look screwed up in a different browser, while they do work on SOME others, which proves the lack of proper markup.
I would like to add that WowBB does indeed stand out between the majority of other Bulletin Board scripts, simply because it's also packed with actually useful features. However, WowBB doesn't really make me feel "Wow", and with all the good Bulletin Board scripts out there that don't cost any money, WowBB would be the last thing I'd spend any dollar on for that matter.
A 2 for effort.