I have done both the videos and did find them hard on the muscles. Some good exercises for strengthening and toning. However, I do ballet classes and bought the DVD to keep my fitness up during the holidays outside of term time when there are no classes, and I was expecting more of a dance element to the exercises, as that was the attraction of this DVD vs any other pilates/yoga-based DVD. Most of the exercises are floor based, and the dance elements that are included are quite fast, and even though I do ballet classes I found them difficult to follow at first.
The pace of the DVD is quite slow and I think I will get bored of the instructors voice if I do the DVD too often. If you were to use this to get into ballet, you may find it very different from any classes you attend as there are many different styles of ballet.
Overall, good if you like the way ballet dancers move, and find this inspiring and the exercises are good for toning and strength.