I love Leslie. I think she's cute and her system is great for beginners.
I bought it for my mom who has a terminal lung condition. She uses them from time to time to keep her endurance up.
Unfortunately the entire system is not challenging for more advanced exercisers. Too much isolation not enough intensity. I would highly recommend it if you're just getting started or if your body can keep fit with easy to moderate workouts.
If you have stubborn fat and you're not new to exercise your body definitely needs a workout plan that's about 10 times harder than any of Leslie's dvds.
Take it to the next level with Body for Life for Womenhttp://www.bellaonline.com/articles/art32613.asp
You can also try Lean Long & Stronghttp://www.bellaonline.com/articles/art28086.asp