Here is a picture of my 66% torso that I got from Bobcat's less than AR500 steel last year and one of some steel my neighbor got from some other guy at the 1500 recently. My torso has been getting abused all year. The other stuff had one short session. All I can say is
I love the dueling tree from Bobcat Steel that my buddy bought. It makes shooting against each other so much fun. We have even used our ARs at 50 yards and it takes the abuse like a champ.