I think anybody that says, "You can be slim in 6 weeks!!!" should be taken out and shot. I mean, really, unless you have less than 20 pounds to lose, this statement is just a pipe dream.
Having said that, I haven't been sucked into the Slim In 6 program, but I did pay about $150 for the Six Week Body Makeover. Huge waste. It was incredibly restrictive and his philosophy on exercise does not match my own. He's trying to keep you out of ketosis, which is your body burning your own muscle to survive . . . I think you lose it by eating sensibly, working out HARD, and finding a lifestyle you can really live with long term. Not for just 6 weeks.