I love it and have lost 3 stone in 8 weeks so far!
Funny thing is, I did just that. I figured I could probably afford it, and then decided to look a bit more into it. Unfortunately the CD website says that they won't provide anything to anybody who only has less than a stone to lose before they're in their healthy BMI range. My healthy BMI range is about 9lbs away so it looks like i'll just have to stick it out the hard way!