I almost didn't buy this based on the reviews. I have a Leslie Sansone walking DVD that has 4 walks on it. (1, 2, 3 and 4 mile walks) I'm able to do the one mile and I tried the 2 mile and got to a mile and a half. It's not that I'm out of breath but my calves burn so bad that I can't continue. She uses the same 4 or 5 steps over and over, for some reason it really hurts me, and it doesn't feel the same as going outside and walking a mile. I'm on the road to recovery after an extended illness with over 7 months in the hospital. Sometimes I don't realize how unfit I am, so the poor reviews about how this wasn't a good workout almost swayed me to skip it. Then I saw it was on Amazon instant video and it was only 7 dollars so I gave it a try and I'm really glad I did. Personally I don't care if some of the exercisers get confused or miss a step. I don't care that all 4 workouts aren't led by BOB, although I love him dearly. And I don't care about music, and if Bob does all the exercises. I care that the workout gets me fitter, and helps me build endurance. After 6 weeks with Leslie Sansone I've not gained any endurance and several times almost quit because of the pain in my calves. This walk has a variety of moves, as well as gentle bursts of cardio to get you fit. I'll still use the Sansone video and would recommend it for those trying to get in shape, but this one is my favorite of the two. I like the variety. I'm not sure if I would be able to do the whole one mile without my previous 6 weeks of walking, but I did complete the first mile and was breathing hard, and got a bit sweaty. If you are an advanced exerciser you probably won't get much good out of this, but if you are recovering or just starting, it's worth 7 dollars. It's worth 20. The only thing about buying on instant video is that you don't get the marathon workout schedule. I may but a hard copy just for that.