I have been sticking with this "health plan" for quite awhile now. I went from a size 12 to just about a size 2 within eight months because of this with the addition of exercise. It's super easy to follow, results are almost immediate, it's actually not at all restrictive after the initial 17 day period and the main purpose of this plan is to change your lifestyle to pursuing wellness and fitness and not just about losing weight. 17DD changed my life. The plan as written provides a great basis of how you should actually be eating and once you get through the first three cycles one time you can mix and match so it is not so restrictive. I don't know of any other "restrictive" plan which allows you to eat cheat meals without remorse and incorporates allowances for wine. The cons of this are actually more aptly in terms of time consumption because of cooking time and endless time spent planning meals and cost because lots of times when you convert to this way of eating you tend to spend more because you are tempted to buy organic. But the cost is also a pro because there are NO shakes or pre-made meals to buy or pills or any of that nonsense, you don't have to be a subscriber to subscribe to a new you in this instance.
If you can cook, and odds are if you're on this website you are at least capable and functional in the kitchen, then 17DD should be the first avenue you try if you'd like to see results and do it in a way that is realistic in terms of the rest of your life.