Angie: There are tons of threads with this info, but I know it's hard to search and find exactly what you're looking for, so I'll condense it right here.
How do the workouts stand up to Cathe? They are definitely as good as Cathe, as tough as Cathe, but are completely and utterly different to Cathe. There's no step, very little cardio, the weight routines are set up so that you do the number of reps YOU want to do, as opposed to following the instructor. There's no fancy choreo, it's very basic but HARD.
The workouts run from 16 minutes (Ab Ripper X), and the next shortest is Cardio X at about 45 minutes. Most of the others run an hour, but Yoga X is 90 minutes.
There's nothing I dislike about the program. I'm in Week 10 and still loving it. I love the results (obviously), and the structure of the workouts and the fact that you push to be what YOU want. Tony Horton's style is different, but I really like him and find him hilarious.
My SO would never go near a Cathe workout, but he's doing these. Just the weight ones right now, but he's showing interest in Plyo and Kenpo as well.
Hope that helps!