Long term weight loss program?

Hi all,
I’ve been looking for support on a long term weight loss program. After being tired of all other things that are said to be good for weight loss, I’m planning to join a long term men's only weight loss program in Toronto. This program was referred to me by my friend who amazed me with his weight loss. To be frank, his change made me think about a program like this. I don’t know whether it is going to help me or not. But I would be glad if someone who had attended such program before can share their experience. Thanks.