jes,
I have been on core for one week at WW. I am now on their "flex" plan. I think their "core" program is a great one if you can stick to this kind of program. It mostly consists of foods that you would equate with "clean" eating.
There are lists of foods on the core program that you pick and choose from, things like lean meats and poutlry, eggs, fresh fruits and vegetables, beans and legumes, whole wheat pasta, oatmeal and brown rice.
You don't have to "count" these foods like you do on the flex plan. You just eat until you are satisfied. You get 35 "flex points" per week to spend on top of your core foods to spend on things like cream in your coffee, going out for pizza, alcoholic drinks, a piece of birthday cake, etc.
The reason why I switched so quickly is for accountability. I try to eat mostly core but sometimes I would have something that wasn't core and this was happening more and more. I decided if I counted all of my points per day and stayed in my point range it would give me more control because I am staying within a certain number of calories.
I have been on WW for 2 weeks, I have lost 7 pounds. I know mostly water, but hey I will take it.
The website will let you take a tour of the different plans.
Good luck,
Lori