I used these shoes straight away as many have said. After about an hour on the hard court, my legs started to hurt. I decided to send them back and informed Tennis Express. Of course, since I "used" them, there was a 50% restocking fee and I would have to pay postage! I decided to give the shoes another chance. I found a website that says if your feet hurt when wearing new shoes, try a different lacing technique (of which there are several). The next time I tried a different technique to give myself more room on the top of my foot. Voila! It helped and now they seem to be fine. I wonder why Tennis Express never told me about this 'fix'.