What do you guys make of Barry Thornton's suggestion that Perceptol 1+2, 1+3 is the silver bullet of developers? I also cannot understand from the his Edge of Darkness book why the pyros he developed (dixactol, exactol etc) are better. They're better for landscapes? They give more acutance? If grain doesn't matter, as he explains, then why the Perceptol and not just his pyros, or the other pyros? I personally think that he stopped short of explaining the difference when he realized he should have published the formula of dixactol. But maybe I did not understand well.