I was reading a post yesterday where someone said GAT's pre was the best they've ever had, so I pulled a label. I had a WTH moment as I stared at it and thought "wow, they just used a whole lot of new ingredients" until I found a different label that had each thing broken down. It wasn't a bad ingredient list, but it wasn't ground-breaking. It was also a prop. blend matrix, so I have no clue how much of what was in there.
Point being, I don't really know, but I wouldn't spend my money on it with what some of the price tags are when I know plenty of other solid companies around here that make great products in the same categories.