4DS grew on me. I didn't totally love it at first. I loved the new choreography in the step workouts and while they were fresh and a bit more complex than Cathe's usual step routines, I didn't find them as intense as her usual cardio. I really like the weight work too. I remember Cathe said something to the fact that she kept the cardio at a lower intensity b/c the goal was for us to have the energy to lift heavy. There are a lot of premixes but I don't think they were as well thought out as they could have been or there may be other factors that I, not being a insructor/producer, just aren't aware of. For example, I would have liked a shorter total body premix that maybe utilized a push pull method or at least mixed it up a bit lasting no more than 70 min. and better yet a total body premix in one hour.
4DS is a keeper for me at this point, though. Sometime I want to pair it up the 4DS weight work with CTX cardio.