I LOVE these shoes. I'd tried the Nike Air Rifts, but they felt stiff, and I found my toes cramping a lot. I saw these in a store and slipped a pair on and instantly fell in love. I've had them for about 3 weeks now, and they have felt like walking on air since day one. I didn't have to break them in or anything. My only complaint is the colors are pretty garish, and I wish they made some with more subtle coloring. I'll still be buying more. These are hands-down the most comfortable shoe I've owned (and I'm 38, so I've owned a lot of shoes).