Come on. Waste of money?
I think that may be a little harsh...
There may be slight variance of opinion among growers, and everyone certainly has a personal preference, but to say one brand is a waste of money sounds like hyperbole stemming from a personal gripe. So far I haven't seen that AN is a 'waste of money' compared to the GH I was using... especially since I got it for less than the GH, and so far, just like AN says, it's been outperforming GH.
All nutrients, GH, AN, Dyna, they all work just fine. If the grower screws up, it's his fault, not the nute's. If one nute does better than another, it's not necessarily the nute itself but any combination of factors.