Ah, yeah, I forgot that Cort-Bloc is mainly a PS supplement. All the names start to sound the same, so I lumped it in with the ones that are definitely junk. My apologies.
I believe the jury is still out on PS. Some say it's great at blunting the cortisol response to training (~ 30% reduction, I believe), while I've heard others say it only blunts non-exercise related cortisol.
Lots of info to read, and I think this is one of the things you have to make your own opinion about.