Have read a lot of bad things about them.
Gossip is a Form of Ear Pollution, but word on the street is Pro Comp is out of bussiness and RHS bought the design a few years back, stuck a bunch of money in the design to make it better.
I don't know about you, but I never want to be the guinea pig on any new casting.
Save yourself a headache and a bunch of CASH$$$$$$$, Dart, Brodix and AFR will help you obtain any power level your looking to achieve....
Good Luck