About the only reason to use B1BS heads these days is if you work for the Koffels or Brodix. Other than that I can't think of a single reason why anyone would spend twice the money for something that requires custom headers and special rockers and doesn't make any more power. Koffel and Brodix should just admit it was an evolutionary dead end and move on to better things.

I see the same thing going on in the FE world. Over time, guys have created expensive FE heads that work okay, but now the new Trick Flow head is much less expensive and just as good or better.