I didn't mention that I had lapband surgery and I can't imagine why they would have an issue with that at all to be honest. Especially for me being out 4 years. In the beginning, when I was losing a lot of weight, they may have but now I hardly ever lose so it won't be an issue :) I can't imagine not being allowed to join. Think of the money they lost on that person!!!
I think it's an individual decision because I never ate less than 1600 calories and didn't focus on carbs or anything like that. If your particular diet is lower in calories than they "prescribe", I don't think I would waste my money on it. It is very expensive and if the diet isn't one that suits your life, then I would do what works better personally for you.
I am up 43 lbs from my lowest so I had to do something.