My husband and I are actually trained in NaProTechnology. It was first presented to us ten years ago by our pro-life and Roman Catholic friends as an ethical alternative to the pill, and, in our self-acclaimed wisdom, we trained in it the summer before our wedding to ultimately avoid pregnancy in our marriage. For the next two years, I carefully charted and met with a nurse (year one) and a doctor (year two) for guidance and assessment. As you know, we were quite successful with the method.
We have since then used NPT to try to get pregnant, and it has not been so successful for us there. I was able, however, to point a few seminary friends suffering from PCOS to a local doctor trained in NPT, and some of them are mothers today.
My humble opinion: As an educational tool, I am not opposed to NPT. I learned a lot about my body that helps me cope with the ups and downs of barrenness today; however, you will notice that I do not publicly advocate for it. My main reason is that most people who ask me about NPT are not interested in using the method as healing medicine but as something very different.
My husband and I regret our decision to avoid pregnancy early in our marriage. Sometimes, I even regret knowing all the ins and outs of my cycle, hormones, etc. It is something I can never unlearn, and there are definitely days when I would rather forget all about it.