Trick Flow 440 heads, The Real Deal?

My 470 low deck was making around 660 hp with the new Trick Flow heads last time I had it on the dyno. The Trick Flow test numbers seem reasonable to me. If I built a 440 like theirs I'd expect roughly 600 hp also. The heads are very nice right out of the box. I don't think there is a better value on the market right now for a street/strip BB head.