Here is the link your trying to find.
http://www.broadheadtests.com/MECHANICALVSFIXED.html

As for slick tricks, They are sharp, and fly well. They cut a big hole in what they hit, and tune easily. If they break, they will break at the ferule where the insert screws in. If a muzzy breaks it will break or bend right where the steel tip screw onto the ferule, If a snyper breaks it will do so near the tip, if a rocket head breaks it will useually be the blades falling out etc. I am not bashing any of the other heads or Bluefeathers comments, just stating that all heads can and will break, and useually in the same place. No head is perfect and you will have to decide if the features it offers are what your looking. I have used the slick trick 125's on game with excellent results and no damage. Bluefeather did not have such good results. You will have to weigh the info and decide. Personally I wouldn't have any problems using them again.