Yes they work for chicks. I use them on them. I would not use them in first week or two though.
I have those cups on 35 gallon plastic barrels. I use an O ring to make sure they do not leak at the barrel. I also thread the barrel.
I put a little ACV in each barrel and I can go 2 weeks without cleaning them. I use a toilet brush to clean the barrels every two weeks, I have them set up all over my yard so the birds are never far from water. It also gives my wife something to complain about so she ignores the really bad things I do....
As for winter. They are not great. I used them in my coop but when it was below -10 the throats froze up. I put the 35 gallon barrel inside a 55 gallon barrel insulated it and dropped a livestock heater into the bottom of the 35 gallon barrels... Did that make any sense?
I wrapped the whole thing with that shiny silver insulation that is basically aluminum foil covered bubble wrap. I cut holes for the water cups to slide through. I had to point a heat lamp at them 4-5 hours a day to get a days water from them. They tend to freeze right in the throat of the cup.
I am using them now with no trouble, my spring is about like the rest of the worlds winters. So they may work for you. For me I am going back to double walled steel founts on those heated bases and carry water all winter.....sigh...
Have you tried the horizontal nipples? They may work better than big cups like that and I hear they freeze less than vertical nipples. I have the horizontal ones but we had a very mild winter this year plus I have a 5 gallon bucket but it works well. I didn't put the livestock tank heater in and 2 nights it froze, ice on top and all the way down the sides over the nipples, but oddly enough, they never froze up, I just tapped them, harder than the birds could, and they still worked. They were a little bit harder to press but didn't stop working. And on the warmer days the ice melted by afternoon. I really like them. Though maybe with more birds a 5 gallon bucket might not work but I,hear people even have them on 55 gallon drums and have success.