Salemdawger,
Evidently they have not came that far. In this post it mentions how they have fallen apart.
"Pick up my arrow and notice the Rage 2 blade had no blades at all! The head had come apart at impact. I found one blade next to the arrow."
I just do not see why they are worth a risk. I used to shoot a 125gr Rocky Mtn iron head then went to the muzzy 125 for the fact that they are easy to find and priced right. After several elk I am not changing back.
I shot a bull 2-3 years ago. The shot hit the elk in the thickest part of the front shoulder. Broke through the shoulder and a rib on entry side, then passed through the far should blade and lodge just barely poking the under the hide. The arrow broke in 2 pieces due to the shoulders breaking it up. The broadhead could have easily been filed at the tip and replaced blades.
Ultimately to each his own, but when I hear a broadhead fall apart, I will not be using it.