[This review was collected as part of a promotion.] First use was loud! These shoes squeaked, they also had a ‘click’ at each step. I could tell they were very light. Stable. And propelled me forward. After a couple of uses, over 10 miles, the squeaks stopped. Now it’s a very light click, and I forget about it. What I experience now is effortless running. I look forward to them. The lightness, the springiness, The surprising stability. They are expensive, but why not experience the best? (Look for them on sale, it happens.). I did get a sore/cut in my left heel after a couple of weeks. I placed a bandaid there and changed sock choices. I feel it is the minimal cushion back there, and my left foot is a bit bigger. I’ll deal with this. Now I shall see how many miles I can get out of them. Good luck with your decision.