This in conjunction with vB's inbuilt SEO will be fine... This product doesn't take the place of other SEO features like mod_rewrite/etc... It just captures search terms used to 'find' your site and updates the cloud to include those particular keywords, thus giving you relevant longtail keywords.
In short, this is merely but one weapon to use in the SEO battle, it isn't a 1-stop solution to SEO though.
/correct me if I'm wrong\
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