I think that maybe your largest hurdle. It worked great for me, but i used a very strong authority site, and the competition wasn't really difficult. Too often tools rank competition on search volume, and that is just not always the case.
It's definitely worth something, but its not going to skyrocket everyone. Low competition keywords, and middle - high competition keywords if you use high authority sites.
It probable that you can't just rank anything at anytime, but i will say what is excellent about it, is the speed in which it works. Most seo is coupled with a lot of waiting. With your system, you will know if it works within a day.
I think people with strong sites with tough keywords are going to be disappointed, but easy targets are going to get blasted. Its not the cure all for seo, but its definitely a nice addition.