"What do you know about NFP?"
enough to know that I'm finished with it.
Finito.
Caput.
" It is highly effective"
Not for me it isn't.
"I am very pleased with experience."
I'm happy for you...it certainly makes life easier to find a method that works for you and won't send you into the fiery pits of hell.
I do know that there are women who have better luck with differing forms of NFP.
I originally started with the sympto-thermal, now I just use the creighton method. Sympto-thermal isn't as widely used, but I found it to be the most reliable.