I used to go to Rosemary Conley years ago and it was good as you get a work-out too. I'm not sure if other slimming clubs do the work-out bit. I needed to lose 1 stone at the time and I did it within a couple of months.
Ive been going to Slimming World for about 14 months now. Ive lost 2 and half stones. I still go as I need to lose more and know if I didnt I could easily put it back on. It keeps me motivated. I have found it far easier than when I went to weightwatchers. Give it a go. Good luck
I haven't tried any of the other slimming clubs but have done slimming world a few times and got really good results each time. It does obviously depend on how much you stick to the programme but even being as fussy eater as I am I found it pretty easy to stick to.