It is certainly worth it. After losing 6 stone at I did a re-feed 1st Dec 2011 (I was on lipotrim) and I came off it for about 7 weeks and I actually lost 3lbs. And I had so much chocolate, I was careful though. I had dominos too hehe.
Then I lost another stone and a half when I went back on it. I came off in about February because I was happy but I did not re-feed then a few months later my boyfriend left me after two years and planning uni around him, it was heartbreaking so I just ate and ate to comfort myself.
I was off lipotrim then for at least 4 months and gained 2 and a half stone- my fault for not refeeding and over eating.
However this doesn't happen when you re-feed. Don't over do it but don't be scared to have treats, at Christmas I was so scared to eat when I came off it, thought I had put loads on (I'd lost weight tho lol) and on Christmas day I had my first panic attack because I had worried so much about my weight. It was awful, I thought I was dying.
So don't worry too much be proud of the weight you've lost, re-feed and be careful, make sure to treat yourself and you'll be fine
Good luck my lovely x