Ok, so you are getting PS for strength. I just ordered it myself after doing Cathe for years. Can you believe its taken me this long? I have more will power than anyone I know when it comes to NOT buying things bc I want to save money. If only I could apply that to my eating habits. But I am getting off track... Cardio...
Cathe tapes ARE a lot of high impact. Many moves--but certainly not all-- can be kept low, and I often do keep it low. Cardio Kicks feels like a lot of high impact to me. I want to get those Power Strike Millenium tapes everyone talks about myself.
Cathe also has a lot of choreography as you probably know if you've done CTX. Rhythmic step is really fun. I thought it was pretty easy to learn, but others still think it is difficult. I give credit to Cathe's superb cueing. I have another CIA tape I still haven't mastered.
Cathe often suggests people put interval work into their routines for weight loss. Cathe's Interval Max is an awesome tape. I agree with the other poster, too, about Intense Moves by Reebok, also an interval workout. It is fun and has simple choreography. Those intervals last 60 seconds. I'd swear Cathe's are longer (and harder). But there was a day when I swore Intense Moves was the hardest video I'd ever done and was darned proud to finish it. I give it up a thumbs up also.
Again, I love Circuit Max. It has aerobics, kickbox, and step. It is circuited with weight work that combines legs and arms. Many here think it is the toughest or second toughest Cathe tape there is.
I don't have Cathe's older step tapes to comment on them.
I am not sure I've been any help, but is was fun to think about.
Jeanne