Good luck starting! I LOVE IT. I'm down 16 pounds so far in four weeks, but that's including three days way off plan (one in week 2, two in week three), which threw me out of the fat-burning stage and caused me to gain back 3 pounds. Then I had one of those "What the heck am I doing?" moments and decided to be strict with myself. Now I'm down 5 lbs since Wednesday
I agree with the above posters — you need to stay absolutely on plan (800-1000 calories, fewer than 100 carbs). If you do, it's a magical diet. Otherwise it ends up being very expensive food-like crap.