I have a copy and I love it! Learned so much about my body from it and even DH has read it! I think if you want to ntnp then it's definately not for you, as you WILL know when your fertile days are. I can tell without even trying now. But if you're planning to TTC some day then it's a great idea to have read this. Or even if you're just wanting to use it for contraception, like I do at the moment.