it's not as bad as you think...it's just that they're Iron and if you are going to tear apart the top end and BUY heads to open it up, why not reduce the weight while you're there with a set of aluminum ones?! That's all, really. There is nothing negative about P heads, they work just fine. If they're free and you have nothing better to do, sure throw 'em on! But personally, I wouldn't waste my money on them. But I'm an all or nothing type of dude.....maybe that's not a good thing
