i'm finishing up my 3rd week of P90X. i'm not incorporating Cathe's workouts at all at this point, although i think as i go along i'll probably pop in her kickboxing style workouts in place of the KenpoX workout just for variety.
there are three different ways to do P90X. Classic (if you want to focus on muscle growth) Lean (if you need to lose some bodyfat) and Doubles (if you really want to burn the fat and add extra cardio). i'm doing the Lean program the first time around. when i finish i may either go back through again doing the Classic, or i may do a Cathe rotation. i need to keep changing programs to keep things interesting.
i love the instructor - Tony Horton. this man is 45 years old and in incredible shape. he works you hard, but he's a goofball too. and like Cathe, he always introduces unique exercises.
i love the fact that you do something different every day. Yoga, Kenpo, Strength Training, Cardio, Core - i feel like i'm getting fit all over. i can't say enough good things about this program. i love it. and the ab workout will wreck you.
i've heard great things about Slim Series too, but haven't tried it myself. keep us posted on what you decide.