I really enjoyed Curves - the concept, the time frame, the social side of it etc. I didn't lose much weight on it, because I wasn't really trying. I would go once a week and that really wouldn't help anything (you have to go 3-4 times a week).
However, my mum, my mother-in-law and my aunty all go to the same Curves and they all absolutely love it. My mother-in-law is as skinny as a rake but at the age of 67, it is great for her to keep moving, keep physical. My mum lost 51cms from all over he body by going and my Aunt has lost a heckload of weight.
So you have to be in the right frame of mind, yes, you have to also have an eating plan to go with it to get full benefit and you have to go religiously.
It was alot of fun though - probably more fun than the Fitness First I go to now.
SW - 71 kg
CW - 65 kg
GW - 58 kg
Weight Loss so Far = 6kgs
Weight to go = 7kgs