I am using the cups on my smaller chickens but they don't seem to have the act of pushing the valve to get the cup filled back up. I plan on watching them and if it continues I think I will try the nipples on them because my leg horns love the nipples.
Sorry for the late reply. Sometimes from the phone it's hard to find your way back to a thread. The horizontal nipples worked out great. These are what I'm switching all my waterers to now. We had a hiccup ordering the cups (they never arrived) so I didn't get a chance to try them out.