Slipknot's not metal. Pinch harmonics are incredibly easy when you tune your guitar down 2 1/2 steps and if the music ends up on the radio (despite the band's previous attitude) then there's not really anything insane about it. Slipknot has gone places because of their image, whether they intended that or not, their image has played a huge roll in their success simply because bands cannot escape the image side. Even rebelling against image causes an image. It's just the nature of the beast. Now I'm going to go listen to real metal.