And how postitive were they?

I looked around for a testimonials page but didn't see it. Currently, I am in the market to aquire a SEO tool for my forums, possibly my entire site and just trying to make sure and get the best available.

I am looking for more than a simple PR upgrade, as that is easily manipulated, and basically worthless, IMO. Looking for people who gained SERP by this software, and input on how it affects the speed of your forums.