I started the BizHat Forums on 2003. I was using free phpBB forum software on the site until recently. On Auguest 4, i have upgraded the forum to vBulletin as it offers more features.
On phpBB i used able2know seo. It worked good. On Vbulletin, there are some free seo mods available, but vBSEO seems more professional, well supported and easy to install.
After installation, i see some increase in site visits.