Has anyone done this?

I am slightly overweight. I was before baby and then I gained 60lbs when pregnant. At 36 weeks pregnant, I found out that I have a congenital heart defect. The extra weight when I was pregnant caused it to get worse, so I'd really like to get myself healthy and lighter. I worked with a girl who did South Beach and had ridiculously awesome results from it. I've done a bunch of research and I like that it detoxes your body and then teaches you how to eat healthy, which is really what I need.

So, any personal experience? Would you recommend it? Why or why not?