I had some pronation running distances 10km and over and my knee plus hip started to take some mild damage. I purchased these stability shoes in the hope I could keep running long distance and I am very happy I made it through a10km run without any trouble. There is also good acceleration in these shoes when you need it. I don't think they felt heavy or clunky to run in but when I need to run tempo or intervals, I wouldn't select these. I will use these shoes for base and recovery runs only.