I did try that stuff a while back and found it to be useless. I followed the directions and it just didn't do much. I am still running my summer tires, but when I switch to my AS's, I will be putting a coat of Poorboy's Wheel Sealant on the wheels before they go on the car, which really does a nice number on cutting down brake dust.
I wonder if the finish makes a difference in how that stuff works. Mine are obviously the factory silver with clearcoat. I've noticed a very large difference. I'm happy with it. As always, YMMV.