has anyone actually send in their pair of adidas shoes for warranty? i've always worn out shoes before 6 months and i never sent in a pair. so im wondering how service is. how long does it take to come back? what do i need to ship the shoes? Can i exchange it for a different pair of shoes or color of the same one? Will i be getting the exact same pair (as in new but same color/model) i send in? thanks for any help!