I don't know if they are different from whatever you have, but I used nipple waterers in the past. I always had the sense they were not drinking enough, and whenever I'd put out a pan of water just to see if they were thirsty despite the constant availability of the nipple waterers, they'd go crazy and tank up from the pan. I know that lots of people use nipple waterers without losing birds due to dehydration, so it must be okay, but I switched back to regular waterers, because it seemed like the chickens had such a strong preference for drinking from a pool of water rather than from a nipple. It makes sense: birds evolved drinking from puddles, not from nipples.