I am used to my Nimbus (which I buy over and over), and I was very disappointed with this shoe. I ended up exchanging my 7M pair for a bigger size (half a size bigger), and I am still not happy with them. The arch support is not right, the sizing is definitely not right (7.5M feels now too lose, my toes wiggle way too much, the arch sits too far behind, almost under my heel... but the 7M was too small and my toes hit the front of the shoe when running). I might just be too used to my Nimbus, but I feel that this shoe &#34;goes flat&#34; after 4-5 miles of running. Not good for serious running. But quite cute to look at.