Harold Brookshire is the guy's name.
I usually stay out of the Purple cam threads because they quite often turn into pissing contests, but here's my .02 -
Purple cams have fast open rates, but also have very fast closing rates (more than likely a mirror image of the opening side), which can make the valvetrain noisy and can induce valve bounce. Not good when you're trying to close the intake valve at a precise time and then it bounces off the seat, losing some of the intake charge back that was starting to compress in the chamber.
Also, the quality control is not great. I've had problems with other MP parts fresh out of the box, but that's another thread.
