I'm on the low carb version of the Curves diet (and exercise program)! I really like it a lot! In the first 5 weeks, I've lost 15.5 lbs and over 20 inches.
Phase I is difficult to get through (and I felt really WEIRD physically by the end), but Phase II I'm actually having a hard time eating everything. I wouldn't call their diet low carb, actually, I think it's more reduced carb or balanced carb? It's certainly made me think about what I'm eating and gotten me completely off white bread, rice and pasta.
I do find that I can't follow what they are recommending I eat. I actually took the values and try to meet them with my own foods. I also can NOT write everything down in their book, it would drive me crazy. I use fitday to track everything.
My best friend and I are both impressed
I think it's worth a try.
Feel free to PM me if you have any questions and good luck!