I purchased 2 of the medium sized Peapods (after a personal recommendation and then reading the excellent reviews) for my partners bed, she has incontinence due to early onset dementia. I am generally pleased with their performance and they have made life easier in this situation. However, usually a small amount of urine does pass through the Peapod with the result that I back it up with two layers of normal towels underneath to absorb this small excess. This system works well and the bed sheet always seems to be dry. It is for this reason that I have given 4 stars.
I would still say that they are worth the cost, obviously I alternate the two Peapods each night and am thinking of getting a third one as extra backup.