I think they're cheap crap. They're popular because of the name, the styling, the fact that they have more bass than the beyond crap ones ipods come with, and they seem "edgy".
I've used a lot of headphones, I'm pretty pleased with my Kicker earbuds now. I've got a set of the EB71s which a nice, and a set of EB141s which are badass but a big too big. These blow the expensive ass Bose ones my sister has out of the water.
I want to try the DD ones and the RF ones. And the EB101 Kickers, they'll probably sound pretty good but not hurt because they're so frigging big.