After 6 weeks of maintenance staying under my target weight, I'm now a Lifetime Member. As long as I weigh in once a month and stay no more than 2 pounds over target, I don't pay a fee. I'm planning to keep going weekly for a while anyway, especially as I'm still finding that real maintenance point level and as they are handing out information each week on their new/revised system.
Maximum loss (I was up a little this week) was 47 pounds. And 4-5 clothes sizes.