Well maybe it's just me, but Cathe makes 23min seem like more! With the warm ups (which are quite active) + the cardio and cool down, most workouts are at least 25-30min.
They are (IMO)like mini Imax's, because each has intervals stuck in there somewhere, with the exception of All Step I think. But I use the cardio's on a regular basis either alone for a quick worthwhile workout, or with another strength video if not using the strength from CTX.
I think it's a fantastic value, but only if you're in to Cathe's cardio, otherwise, you can just get the CTX Upper Body + Leaner Legs and you'd have the weights segments. But for me, the cardio's are a super value. If I only have 30min for aerobics, I KNOW I'm getting an intense, heart pumping workout with any of the cardio's from the series.
Donna