I've heard its on its own level of fucked-up-ness. I downloaded it yesterday and planned to watch it tonight. Everyone agrees, this film goes places no other film has dared to go. Most people who laughed in the face of Salo, Irreversible, In a Glass Cage etc say this movie almost goes too far.
I'll let you know what I think in a few hours.
trailer (VERY NOT SAFE FOR WORK):