My husband owns a boxing gym & does tons of agility drills with his people & fighters using ladders. He does the drills inside the gym & also outside on the hot Arizona pavement. Our old ladders finally broke down after 6+ years, couldn't recall where we had bought the old ones. So after lots of reading of reviews, we decided to go with these ladders, the 30'. These are made much like our old ones, so hopefully they'll last a long time too.So happy we did, they are great! The weight makes them lay flat, they are not flimsy whatsoever. Most importantly, they do not slip AT ALL, they stay locked in place.So, as you are deciding whether or not to spend the money on these, it's well worth every penny because they lay nice & flat & do not slip out of place.