Well, you've already decided to buy it, but, I simply have to say, "OH MY FREAKIN' HEAVENS! BUY IT!" They are great for days when you do not have a lot of time, but you want a hardcore workout (they get more done in 30 minutes, than many of the others!). As add ons to other workouts, they're killer. And for variety? Not sure if you want to do step or kickbox? Do both!