HIT (the way mentzer preached it) is fucking bullshit.
It works for a LOT of people including me. His older style where you worked every body part once a week on a Mon, Wed, Fri. split. My only deviation from this is I work out every other day instead of M,W,F. I know couldn't mentally handle his workout every six days thing that he espoused at the end even if I could get great gains from it.