Watch out low impact exercisers
I appreciated all the reviews - helped me in selecting this tape. However, I have a weak knee so I do all my exercising without jumping or leaping. Karen claims to have representatives doing low impact, well I had to make a few modifications (nothing new). If I had to do it again, I'd buy something else, but will add it to my collection & just not use it as often. Otherwise it is a great workout if you like Karen's style.

great circuit training
Many videos that are marketed as being "circuit training" seem to emphasize either cardio or weights. This video does a very good job of balancing the two. You do plenty of intense cardio, heavy weights, lighter weights, and abs/back. It is designed for intermediate to advanced exercisers, so it is probably not the best choice for beginners. However, there are lots of other great videos for beginners.

Karen sweats and so will you!
A tough workout not for beginners. Cueing is quick. I found I had to do it about four times before I started getting some of the steps down. I like that the workout seems to go fast because of Karen's "get down to business" attitude. The longest cardio segment is in the beginning, 9:15 minutes, so you know you got the longest one out of the way after it is over. By then, I am very warm and in the zone. The moves are not dancy but I do find this tick-tock move she does a bit difficult. The aerobics alternating with the weights and then abs and butt really makes me feel like I have had a workout from head to toe.

Great Workout
I have to say that I do enjoy this tape. I've been using it for about a month and have seen results, however, her cueing is terrible. I still find myself not ready for the transition to a new move because she never cues until she is actually performing the move, therefore, I have to stop and catch up with her. Overally, this is a great cardiovascular workout and she does some interesting combinations during the toning segments.

Excellent workout
I am an advanced exerciser. This workout is excellent IF and ONLY IF an exerciser keeps a good form throughout the workout.
Karen is the best instructor out there. She provides very good technique, no junk.
I highly recommend her workouts and you will see results.
Just do not cheat and always maintain a good form!