I heard about these shoes from YouTubers who started running like Nick Baer and Kofuzi. It's not your "I'm a pro runner." Well, Nick Baer seems to be a pro at everything, but that means you can be too. At an endorphin-2 speed, I ran my second half marathon in 3 months. I lost 7 minutes off my old half marathon PR. It doesn't have the best stability and comfort, but the rebound of this shoe is very good. Going beyond your comfortable pace is less uncomfortable. The only thing I could wish for in this shoe is durability. I didn't use it much, I think I only rode 50 miles on it, but I didn't feel like it was race ready anymore. One more thing, don't walk in the mud. If you don't train your ankles well, you're going to sprain them.