Moldy it probably depends if the benefits outweigh the risks I guess! Some don't like to use them at all. If you are a wreck with anxiety that babys heart has stopped any given moment than a quick few seconds, to simmer down the stress for another day or so, is well worth it IMO. I don't use it once I can feel regular movement, if I've got concerns then, I go in to maternity for a trace. Yes, I worry. A lot
I believe the main danger is that you pick up your own pulse or don't realise if baby's heart is too fast /slow and assume all is well. That and if you can't find it and freak out of course!
Can't believe you BF for 5 years!! Amazing! I haven't tottted up 5 years with all 3 of mine put together lol x