Hi Ladies,
I bought the YBB master series, and they are fun, but if you are used to Cathe these workouts are very mild, they do not burn a lot of calories, I use them as a supplement. I would do Imax 3 and The Goddess Booty which is only 20 minutes, The Goddess Core is another good one. The ab workout is not as intense as Cathe's Core Max. You may want to try one by exchanging on Videofitness or from e-bay rather than buy the whole set.
I hope this helps.