Have killed mature, big bodied bucks in Tennessee, Illinois and Oklahoma as well as a black bear in New Brunswick with the Whitetail Special Pro Series. All four pass throughs that put the animal down in seconds and under 75 yards with blood trails you just walk along till you see the animal you already heard crash. Durability has been, in my opinion just fine, couple heads damaged when they hit rocks after the pass through with enough momentum to do damage. Even if they are a one and done, knowing they are doing the job of harvesting the target animal as quickly and humanely as possible is worth it to me.