I myself tried a mechanical broadhead about 15 years ago and it didn't open up due to the "O"-ring. I realize that these broadheads have changed since 15 years but since then I have taken numerous deer with the "ole reliable" Muzzy 3-Blade chisseled point. Bad to the bone!

I might add, using a Muzzy, you might encounter a few pass-throughs, that's a good thing. Good luck.