Funny you should say that about bananas. I always see that advert on various websites that says 'Foods you shouldn't eat when on a diet' with a picture of a banana... never clicked on it but now you've said that about them being 110 calories each then I'm guessing that's why... guessing they also have a fair few carbs too which makes them worse.
I always liked slimming world because there is some really nice recipes out there that convert normal food into syn free or low syn meals. It's also much easier to count syns (especially if you have access to the official search) or save some up and be a bit naughty at the weekend
I'm just calorie counting at the moment, but think if I wasn't doing that I would do slimming world.