I just got a couple of pairs of the Nike Vapor 3 shoes and they're OK so far, but I was wondering if the Vapor 4's are even better? Has anyone here worn and played in both the Vapor 3's and the Vapor 4's? If so, which do you think is better and why? What are the similarities and differences between the two shoes? Just wondering if I should get the Vapor 4's next time. Thanks. BTW, I think both designs look great.