Hi,
I know several people who have been using persona and nfp charting
for over 5 years now and they've found it really helpful. Im relying
more on my charting than my persona however so far i have not had
conflicting results. I definately wouldnt use persona on its own,
although i know one person who's used it for 5 years alone and she's
never had a problem. For me its more of a backup and when both my
chart and persona say ive ovulated its gives a bit more reasurance.
Good luck with the wedding!!!!!!!!