I was successful with WW's years ago and kept the weight off for a couple of years.
I then did SLIMFAST and kept the weight off for longer.
The good thing about SLIMFAST that I found was that you didn't have to think about food. With other diets I was constantly thinking about food, what to buy, what to cook, how to cook it, how much to have etc. With the shake, I just opened the can and drank it.
I found Slimfast difficult for the first week or two but once I got into it, it was really easy and I found I had loads of energy.