I just received both classics and cardio hits. I have done all three classics and power max. I think the classics are less intense and easier to learn. The music is from the 90's as are the leotards. (My daughters make fun of the clothing). If you are looking for something more intense and choreographically challenging than power max I would go with something else. However, I really enjoy the classics vol 1, have finally reached the level of doing one without a break. Yeah!