and guys, please dont abuse the warranty system. I've known people who buy a pair of CB4.3's with their voucher, used their connections to get a receipt, and turn it in with their warranty card to get another pair. Makes me mad to hear these things because its nice enough of the companies to come up with this system for us tennis players who are hard on our shoes. you're breaking the rules and robbing from the manufacturer. sure, nike is a huge corporation, but that doesnt justify you taking advantage of their program and trying to be a cheapass.
If you can afford all these fancy shirts and polos and jackets, buying a new pair of shoes after one wore out shouldn't be a major blow to your bank account. Play it fair guys.