I lost a lot of weight on WW, but have gained some back. That's why I'm here - I'm not gaining it back again!
I think if you approach WW with the thought/belief it's how you're going to eat/live indefinitely, you'll do fine. It is a plan that spends some time - even if it's only 6 weeks - helping you transition from losing to maintaining, and gives you a vehicle for continued accountability (free monthly weigh-in). At the moment I'm pretty much doing Core, but counting points most days.