This piece of exercise equipment is worth it's weight in gold. I've been a member of countless gyms and hired many experienced, professional trainers. Not one trainer was EVER able to give a workout like this thing does. When you watch the exercises on their DVD, it 'looks' effortless, but the first rep you are feeling muscles deep in your core/abdomen. Even if your form is not perfect, you feel you muscles can't feel with any machine in the gym or with any weight training. Some reviewers said you needed to have a professional training sessions, but I disagree. The dvd's are pretty good. This isn't hard to do at all. They include 2 instructional DVD's with the Chair, but I purchased several more to make sure I was really understanding it. So worth the money.