I've only used these on shorter distances so far, no ultras with varying terrain and I'm impressed. It's a very comfortable shoe, easy to put on and lace up and feels great right out of the box! The cushioned heel gives up a little lateral stability on rough terrain, the grip isn't as secure on wet surfaces as the Jackal or the Cyklon. Also wish it lace closer to the toe with another set of eyelets or a center D-ring but overall feels like it's going to be a solid performer!
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