My neighbor went on it and liked it though she complained of hunger and the $70-some-odd she had to spend on food. She didn't last too long and looks as if she regained all the weight she lost.
When I lived in the Keys, one of the other room mothers in my son's school lost a lot on Jenny Craig. I broke my own rule about commenting on someone else's body and told her how fantastic she looked. The next time I saw, after summer break, she had obviously gained back all the weight and then some. I was so sorry I'd discussed he weight with her the year before.
This isn't really a reflection on the Jenny Craig program. I think it's pretty common to regain lost weight. My impression is that Jenny Craig is a pretty good program.