I've had HUGE success with core. I lost 165 pounds and have maintained for the past 2 months, though I did have a bit of trouble figuring out how to NOT lose any more weight (sheesh - lol there's an issue I never though I'd have to deal with).
My personality type is a little on the lazy side, and I have no portion control / inner "full signal" so core works for me. I knew from day one that I'd be one of those kind of ppl that horde points all day long so I could eat a big greasy burger and fries instead of learning how to manage my points throughout the day to meet my nutritional needs without going over my daily points allowance.
On core, the first two weeks was kind of strange. It was hard for me to believe that I could eat all that food and still manage to lose weight. After that it was pretty smooth sailing. One habit I've picked up from being on CORE is to shop core.. keep a core refidgeration and a fully stocked core pantry with very limited "treats". I could rech into my fridge blindfolded and guarantee that whatever I grabbed would be okay to eat.
What I learned from being on core is that I really do have an inner "full signal". It took alot of time for me to learn to pay attention to my body, and sometimes I still miss it and overeat - but I am human after all - lol the Core plan was a lifesaver for me