I'm am ex consultant
I will never ever join a slimming club of any kind, ever again.
Speak to any former consultant and they'll tell you the same.
Team meetings? Filled with consultants competing about who had the biggest groups, earned the most and trying to steal each others members 
Consultant sitting eating a while punnet of strawberries, followed by grapes, followed by a sw quiche....
The company taking half your earnings without doing the donkey work.
And that's all before you even get onto the training (oh Phyllis, you've 2lb on this week, don't worry about that, you said you'd started exercising so it will be muscle....)
And that's before you even start on the muller lights, mugshits, quark, scanbran, fry shite, hifi bars, mushy fucking pea curry, I could go on.....
But the plan it's self seems to suit people who have a lot of weight to lose, not so much those who have between 1-2 to lose.
I found members with small amounts to lose didn't get on well with unlimited pasta and sw chips and rice and meats....