In a BBC test a few years ago WW came out as one of the best diets. The procedures are good, but it's not cheap. I think you have to find one that suits you though.
The problem with all diets including WW is that unless you either change your eating habits, or stick to the dietting regime for the rest of your life you will eventually gain weight again. It's hard enough to lose weight, it's even harder to keep it off.
save the planet - it's the only one with chocolate