Mine just arrived in the mail. Can't comment yet on its stretch or durability. But I'd guess the durability is great. This thing is a tank -- much heavier than I imagined it would be. I don't know how long the sheathing will last, but the material seems very strong. And the rope itself is a monster. I've done heavy-rope jumping with weighed handles before, and with ropes that were thicker than standard fast ropes -- both of which provided challenging workouts. But I've never used a rope like this. Just to look at it is enough to see that it will provide an excellent workout. I look forward to getting started.
This is a workout all by itself. I really liked the fact that someone had the insight to provide gloves with this jump rope. Great form of exercise. I can instantly feel my heart beating fast after I finish jumping rope.