This will be my forth season to use them, I use the old style 100 grain with the 1 3/4 cutting dia. I dont recall exactly how many deer that I have killed with them but its around 10 or so, and I have never had the first problem with them they always get the job done. They seem to be very durable never had a blade break, I had one pass completely through 1 shoulder of a 70 lb doe and only slightly bent 1 blade, and probably the most important they have always opened for me.