I was incredibly impressed with the OnCloud Flyer running shoe. I have been running consistently for 9 years and for the most part ran in Brooks Adrenaline and bounced between several other brands looking for the perfect balance of support and speed. I can honestly say that I have never run in a shoe like the OnClouds. running in this shoe shocked me at first because my legs did not fatigue and I had an energy that I was not expecting. Day after day, run after run, the feeling of energetic fast runs is still there. I am running better now than I ever have, faster and more fresh than in the past. I plan on running the Boston Marathon in 2020 and I can assure you I will be in a pair of OnCluds. Truly Impressed.