The Snuffer is a good head, have used it in the past. I have many friends that have used it successfully but they have all at one time or another stopped using it. Its not that it will not make an incredible hole, duh, its three bladed instead of two.
It is because of the three blades if it catches bone with one of those blades it forces two other blades at oblique angles to the way they are supposed to cut into the target.
Now as to the people I know that used them and quit it was to a man the same thing, the Snuffer when shot into an animal and does not hit any thing wrong works wonderful, but each had an episode of the animal running off with what should have been a good hit with penetration of a couple of inches and the shaft lying alongside like a rifle scabbard.
It has happend enough to good hunters that I know so that many years ago many who used them switched to a good two blade and never looked back.
Many have had good experiences and will stick with them. That of course is their choice.
I go by what I have seen and experieced and will not use them.