I haven't had pit, but I did have my water broken with this one (unknowingly). Part of the bag got stuck over my cervical lip somehow and it was awful. The midwife had to put her hand inside of me and hold the lip up, trying to get the bag off of it, while I pushed the baby out past her hand. It was... Well, let's just say it felt like delivering a two-headed baby and made me positive I didn't want to have any other children.
Probably not very helpful, but that was my experience with it.
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