i took it at 42 weeks with my ds. my midwife put TONS of pressure on me to do it. i had already tried acupuncture, acupressure and a few other things to start labor but got nothing more than some contractions.
i basically had crazy intense diarrea, while having contractions, for about an hour, then a fast labor and birth. then for the next 3 days i woke up in the middle of the night with crazy diarrea. not really great when you are trying to snuggle up next to your newborn in bed, if you ask me. i really felt like i had no other options at the time. i could have switched midwives, but that sounded really bad to me at the time. it was such a struggle.
looking back, i don't really regret anything, it's just the way it happened to me. i am 100% positive that i will not do it again, though. my midwife with this pregnancy has assured me she's not even going to suggest it and that i am free to wait until my baby comes. i feel really good about that.