You should never walk out into the woods with equipment you are not 100% satisified with or confident in. If you believe what you heard about spitefires than by all means get rid of them and use what you are comfortable with..

I know for a fact that they do work and work well. I use shockwaves now as I have turned the lbs down on my hunting bow a bit and the shockwave is smaller. They also work and work well.

Fact of the matter is in order for any broadhead to do it's thing, it has to be put where it can do its thing. Shoulder bones isn't one of those places..

I don't know why for the life of me, that when people make a bad shot with a fixed broadhead, they will say I made a bad shot.
When they make a bad shot with a mechanical, more than likely they will say, it's mechanical broadhead failure. Don't know why it's true but it is, none the less.

At any rate, Good judgement and arrow placement comes with experience. It takes time to learn what works for ya and what doesn't.