Your going to find that most mechanicals reguardless of manufacture will not be as durable as the better fixed blade heads.. When you say the heads were no longer useable, what exactly do you mean. were the ferules bent, or was the blade cartrige broken? As long as the ferule is not bent( and it takes a lot to bend one), you just replace the blade cartrige( which you need to do anyway as you have shot a dulled the head). The Rocky revolution is a very good mechanical head for deer and similer size animals, provided you have enough Kinetic energy with your setup.

TAKE YOUR KIDS HUNTING AND YOU WON'T BE HUNTING FOR YOUR KIDS