My sense was not that the ones featured didn't keep the weight off -- all are maintaining a weight loss AND talk about their new healthy lifestyles -- but nearly all did gain SOME weight back. I think that's something many people experience -- especially when they push to lose for a certain date/goal. They may tend to push themselves beyond what they can realistically maintain in those situations.
I wish they'd even acknowledged that.
I also wonder how many didn't keep any weight off...
After all, the ones they had on are just a small number of all the people who've been on...