I also have done WW. Reached lifetime years ago but stopped going and stopped following the plan and regained plus. The story of my dieting life, actually. I did the same with SB more than once.
I'm not sure you'll like my response
I am a classic yo-yo dieter. What I found is that I'd reach goal with SB then on PH3 allow more and more foods that I used to eat but had given up while still losing. I'd gradually gain. Slip back into old eating habits. I believe that IF I EAT WHAT I USED TO EAT I WILL WEIGH WHAT I USED TO WEIGHT.
So, what does that mean for me and my eating? I pretty much live in PH 1.5 or PH2. I have found that my tastes have changed. I've developed new habits. I eat veggies every day! Major change for me. I eat more protein than I used to. And I have also learned that there are just some foods I don't handle well in moderation. I do best when I don't have them in the house. For me these are things like crackers and, sigh, bread. And cereal.
BUT - this doesn't mean I don't eat anything or everything ever. I indulge but I don't do that as part of my daily routine. When I go out to a restaurant, which isn't often, I eat what I want most of the time. When I go to a party, same thing. The key for me is to stay on track before the indulgence and get right on track immediately after.
Honestly, for me I think that I will have to watch what I eat for the rest of my life. Like many of the other chicks, I am finding it harder and harder as I get older. (I just turned 50!) And I've had injuries so have been very limited in my exercise in the past couple of years.
I hate to repeat the cliches but they are all true... it is a lifestyle. But I have found this lifestyle very doable and much easier than counting points.