I'll chime in here.
The Weight Watcher's program is working really well for me.
I used to do WW in the past when it was a portion-based system, and I resisted the Points system for years. But when I hit 219.5 lbs (220.2 in December) I knew I had to try a new approach. Even though I have My Fitness Pal, I really needed more accountability, which this system seems to be giving me.
So I actually bit the bullet and signed up for WW Feb 7th, so I do go to a weekly meeting, and track online.
And so far it's working really well for me; I've lost 10.6 lbs in a month.
Since starting Weight Watchers Feb 7th:
Feb 7th: 219.5
March 7th: 208.9
Cumulative WW loss of 10.6 lbs in a month. (Home scale)
You can also eat your activity FitPoints, depending on your settings, they kick in after you use up your weekly flex Points, or vice versa.
If you live near a Trader Joe's supermarket, this is really helpful:
I heard this: there's an app called "itrackbites" which is basically the Weight Watchers program without the monthly cost.
There's also a way to make MFP also calculate Points, except it also counts fruit and veg.
About the banana controversy, I've rarely eaten more than two a day, and they are great crushed up in yogurt, and I was thrilled to be able to have this treat and only count the yogurt Points.
Re making a smoothie, fuck it, I'd just count the ingredients separately. So the banana is still a freebie.
What is the advantage of the Point system? I think for me it's that it is really easier to visualize that 100's of calories. And I'm trying so hard to stay within my Points budget, that it really is retraining my eating. With MFP I'd eat too much and be like "fuck it, I'll just do better tomorrow" ... and do that day after day...