I had an exchange with Rich about this very subject which is probably what got Bryan all pissed off :-). The exchange can be found here. I have built 3 600+ Rwhp cars with two of them actually being dyno proven that have been daily driven over a year and a half now. I have also built 5 550+ Rwhp cars with 3 of those dyno proven that have been daily driven over a year now.
Again I will say that these cars have no where near the bases covered that Bryan's and William's cars will.