I have 4 Skinny Rules workouts (Cardio, Strength, Core and Abs). I actually LOVE these workouts and they have definitely helped me bust thru a plateau. I honestly dont recall if they have music or not because I was too busy gasping for air! I'm not sure how these workouts lend more to injury than any other workout, at least for me. For me I can do these workouts for about 2 weeks in a row and then I need to mix it up. I dont think the Ab workout is must-have. I can see where these workouts can have a dread factor, they do to some degree even for me only because I know the burpees will kick my butt! However, I've achieved some great tricep definition in a short time with these and I feel like I get a great workout in less than 20 minutes. For me, the original 3 dvd set (Cardio, Strength, Core) was definitely worth the money!