"
Most mechanicals open...." Maybe! However, fixed and replaceable heads always open.
Based on reports by some .... reaching many, mechanicals do not open all the time, have penetration problems, and are often and greatly affected by angle of impact.
Since it is the broadhead that kills; not the shaft, nor the speed of the bow, or the latest sight or rest, I just cannot accept that it is reasonable to gamble with the only thing that will make the kill just because the heads act like fieldpoints. It appears they do. All the way into and through the deer.
In my book, " Most mechanicals open" just is not good enough.