I don't see why Storms or any other companies personal rating systems should matter. It should be more important to look at the individual stats of the ball (RG, Differential, cover, finish, and weight block) and determine how the ball would work from there. I understand not everyone can do that, but if you educate yourself on how these things work, you will be less dependant on relying on what the company tells you. If you still want to go by a general scale, go to bowlingball.com, they developed their own scale to judge equipment by. Also, for those of you who actually look at the US bowler magazine, there is a 2007 ball guide in there.