I'm just finishing week 5 on the CD, and I lost 22lbs in 4 weeks. I won't lie, it takes a lot of will power as if you just do the shakes, then NO food is involved, but there are different levels of the diet where you can introduce food. Can't comment on them as I havent tried. It costs about £40 a week for all your shakes/soups/porridges etc, including a weigh in from a consultant, but this price can vary a little as each consultant charges differently (mine is £2 a shake)
Good luck! I would say if you have will power, then it is the best diet around! x