Even though it never saw much carry time at the warehouse, it has seen some heavy work. At the warehouse, really heavy plastic strapping usually requiring som lateral force, (sliding blade under the strap, twisting and cutting it at the same time to open). I recently used it to cut through some downspout while rerouting it. Not thick metal by any means but I cut a fair bit and the insingo barely dulled! I cut up a bunch of cardboard right after before bringing it inside and touching her up. I wouldn't worry about a crk and hard use.