I don't know anyone who has bought it but just watching people use it on the info-commercials makes me think it's very uncomfortable.  I can't imagine that swinging your legs "widely" back and forth like that would be good for the body.  But I can only speak for myself in that it doesn't look likesomething I would want to do.  I would think it would depend on what type of exercise you like to do.  If you like exhuberant aerobic styles of exercise, e.g., jumping jacks, karate and contact sports, then maybe that machine would get you going in the morning.  I've always preferred quiet sports, like jogging, swimming and yoga.  So that's the question I would ask myself before buying an exercise machine -- Does it support the "style" of exercise that I tend to prefer?