Ok, ok, cool down, guys! I must thank everyone for the replies here cos' I got carried away and almost wanted to spend several hundred dollars on that, and the yearly updates cost additional (btw, big boys like Canon, Simens etc, use their software too, according to their Clients and testimonials page).
Thanks to DaveM for the long long post as well.
What stopped me from buying it was:
1) I tested one of their "satisfied clients" website on Google and no matter what keywords I use (based on the keywords in the client's webpage), it doesn't come up in any results
2) I read their testimonials page and a lot of SEO companies seem to be using this software......so I was thinking to myself......if this software is that good and the SEO companies are using it too, then I'm still back to square one cos' I'll be competing against those guys with the same tool, but I've less expertise.
Only thing is that I'm intrigued how they can make such a powerful and daring guarantee, though. I've never seen anyone made such claims before.