I'm doing Simply Filling (after faffing about with a million different diets and putting on weight!) as I did very well on Core. I've rejoined a class too as I don't do well without a weigh-in! They are not keen on promoting Simply Filling so you may not hear about it in class, but basically, you eat three meals a day and, at those meals, you can eat until you are full from any food on the Filling Foods list. Outside meal times you can have skimmed milk and fruit. Everything else has to be pointed (even Filling Foods if they are eaten outside meal times) and you have 21 points a week to "spend" on those foods.
I like it as I can't be bothered to weigh and measure.