For resistance training, I use about 60% Cathe, 40% others (P90X--my new favorite, Tracie Long Productions, Kathy Smith's "Lift Weights to Lose Weight 2, for example). For cardio, it's about 30% Cathe, 70 % others (Powerstrike, Tae Bo, Contender's Club, rebounding, spinning, Gin Miller) since I don't like step that much, and many of Cathe's moves are too torquey for my knees. No matter how good Cathe is, I would get bored with the same instructor all the time. I also like to try different things, which is obvious from my now-200+ workout collection (only counting those I currently own, and not the several hundreds I've gone through over the years!)
I also have quite a few Yoga workouts (someting that Cathe doesn't do).