I ran DAA during my last cycle, which recently ended (someone posted the log a few posts up).
While I can say i definitely didnt feel shutdown, i never really felt "on" to begin with, and my gains didnt make me feel like I was either. The whole concept is very speculative, and im sure it has its limits. Nothing is going to stop deca or tren from shutting you down, but maybe hdrol or something else mild. Someone really needs to test this with bloods. Obviously they should expect the worse and have a proper PCT lined up anyway, but its worth a shot.