Chad has been great. Greg, well ultimately, as long as the heads perform at the level he says they flow then its all good. He continually failed to meet his own timeframes and repeatedly left me wondering what was going on, was hard to get a hold of by phone or email. When he finally did get my heads shipped back to me, a rocker stud was lost in transit through a hole in the box, and despite his promise x3 to get me a replacement, I have never seen it. Overall, not a real fresh feeling when I spent over $1600 with him.