I had amazing strength gains and fat loss using CTX for 6 weeks. I change my rotations completely every 4-6 weeks, so I'm coming close to using CTX again now.
Anyway, even going from weight training each body part twice a week to once with CTX, I still made tremendous progress. It's a really really effective and versatile setup. You can kind of mix and match the cardio and weight segments as you like to keep from getting bored or hitting a plateau and the variety of cardio methods are great for getting very real results. You get hi/lo, kickboxing, step, intervals and circuit training along with great weight training. It's challenging, it's fun and it's full of variety.
It's certainly going to knock you on your butt at first, but just progress at YOUR own rate for what works for your body and you will definitely see great changes in your body with this program. It really changed the shape of my body so much, I was thrilled.