they fit true to size
I've had fit problems with some of Nike's shoes in the past - Vapor 4s, anyone? But I don't have any problem with the 4.3s. I have high arched feet with a relatively wide forefoot and I hate narrow shoes. But I wear my normal size 12s in the 4.3s and they fit perfectly. And the inside of the upper is absolutely seamless. They do take time to break-in, but that has to do with the stiffness of the chassis. The shoe takes a while to mold to your foot and move with you.