Becky,
I bought "Cardio Kicks/Circuit Max" on DVD exclusively for Cardio Kicks and I love it! It's so much fun! I knew that it was definitely more of a cardio workout than of a kickboxing workout and that's what I was after. (I wanted to add variety to my existing cardio from jogging, step aerobics and "Ropesport" rope jumping). There are kick box inspired moves like roundhouse kicks, jabs, hooks and upper cuts. Cathe tells you at the beginning that this workout isn't intended to improve fighting skills. You'll do jumping jacks, "jump ropes", power hops, knee smashes, grapevines, bob and weaves, scoops, speedbags, icebreakers, and of course lots of cardio kicks! I put some power in my snap and recoils on jabs and kicks and I get one heck of workout everytime. I wore my heart rate monitor one time to see how my heart rate fared and it remained around 80-85% of my maximum heart rate for the most part.
"Cardio Kicks" does use a lot of space but you can modify, like Cathe said. Luckily I have the space, but I've done it modified ( go for height instead of laterality and do big scoops or power hops in place to increase the intensity).
I also love that "Cardio Kicks" is 60 minutes long and I am drenched in sweat by the end.
I do less circuit style workouts than I do cardio and strength seperately, so sorry that my reply doesn't include "Circuit Max"!
Libra32