I was actually somewhat concerned the pups might chew on the red plastic bowl part of the waterer, but they never have. I think the way a dog's toungue picks the water up, it is easier in some form of a bowl. That being said, I've been using the lickers in my kennel set ups for years, and I've never heard a dog say one single negative thing about them.
The hog nipples would be the last choice with the other options out there. I think it may cause issues for their teeth over time. JMO though.