Promaxx new iron mag heads, good quality

It's amazes me anyone would even bother producing SBM heads in today's world. How much of a market can there really be?

As for Promaxx, I looked at their site briefly, at their 'Shocker CNC' heads for BB Mopars, and they look kinda funny with increasing CFM numbers out to .900 lift. Is anyone running .900 lift cams gonna be using a relatively low flowing BB head?