I'm a bit of a fitness fanatic and love high energy, high impact cardio exercises. I do a couple of DVD's before work in the morning as well as my normal gym routine in the evenings so I do do a lot, and I know how far I can push my body. I like the way this DVD has a lot of cardio but I found it so repetative with the moves. The most irritating thing for me is the pressure the exercise puts on the knees, without any warning or alternative exercises if you have bad knees.
If you like high cardio and dont have problems with your knees - then this is a good workout and I have to admit a zillion times better than I expected from Colleen.