I didn't like 1 and 2, although 2 seemed a little better to me so I'll try it again, I didn't bother with 3 since I figured I just wasn't going to like Susan's dvds, but someone's review made me go look at the clips of 4, and I LOVE
4!
4 is just pure cardio kickboxing fun! It even has really good music that fits the workout perfectly. Something about the others I found a little boring and I just couldn't get into them, but it's been so long since I tried 1 and 2 that I can't even remember much about them.