They rated the aeropro cortex higher than the original aeropro. Same goes with the pure drive. They rate the pure storm tour higher than the pure control, but I heard they're essentially the same sticks. And as far as I see, they underrated the aerostorm, which I think is a great racket. On the other hand, the k90 receives more topspin rating than the aeropro. The ratings generally increase as new rackets come out, which is suppose to urge the buyers to buy the new ones that the pros use and forget the old ones. As far as I see it, it's a business scheme to get buyers more psyched about their new expensive rackets. I mean you don't actually trust the ratings do you?