more parts to go wrong..jackknife action..blades rotate backward on a pivot upon impact..that action takes energy away from penetration, overly flimsy blades and ferrules, questionable blade locking mechanisms..need I say more? Get a one-piecebroadhead and youll never ask your question again! You have to shoot 75-85 pound bow to overcomeexpandable pitfalls orcome close to a one-piece.....and it would have to be a heavy ass bow at that! BUT...as always its up to you .......so..why ask me~good penetration to ya