First of all, I love this DVD for the way it is set up. In the menu you can customize your workout, you can choose from the warmup, level 1 cardio, level 2 cardio, level 3 cardio, and cool down. You simply add the segments you wish to workout to and press play!
I did level 1 yesterday and my glutes are KILLING me today! It's intense, high energy, and best of all there are variations for different abilities... and the cast of Biggest Loser are the 'models' working out, which is nice because they're suffering through it with you!
The only down side is the cool down, which is 5 minutes of yoga. Excellent on it's own, but I always make sure to stretch really well after it's done. Definitely recommend this for the price!