Ditto. I have many posts in my forums and am noticing that those with 100K to over 1 million posts in established forums do not use vbseo. What scares me is the reliance on one script - encoded - that if something goes wrong you are totally hosed. I also don't want to lose hundreds of thousands of existing links in google. I've heard of various claims and lots of people who own vbseo sound like smarmy commercials ala the "I made $10000 a week using Google Adsense after 2 months" or Extenze male enhancement. The hawking here was ridiculous. I'm not saying it's a bad product but it was just way too expensive and many snakeoil sales tactics rubbed me the wrong way. If the biggest of the big boys didn't seem to need it, nor the growing boards, I figured it wasn't worth the crapshoot of hoping to heavens this thing will continue to work with my forums.
Your call but don't expect things to magically boost all your forums a#1 position overnight. Good SEO is important and just do what you can to optimize your site.