I have 2 pair now, as they feel great! I have the red and white versions, and love them. I have a very narrow foot, so was concerned, but unlike some here, I found the racers to be much more tight and constricting, so they must run a little small. That said, I like my shoes with very little room at the toes. I did a 2 hour run yesterday on a pair with 3 runs on them, and they felt so much better than my DS Trainers and Skylons that I wondered why I waited. I’ll be buying some more pairs before they screw these up. And no achilles issues whatsoever, so they must have changed them. Great shoe!