I'm not at all a fan of plastic. Some outgass strongly and take a long time for this process to diminish. Plastics contain estrogenic chemicals, even ones that are labeled BPA-free. I don't trust them even a little.
And eventually the only thing they're good for is the landfill, and that's
never a good option.
Also, as mentioned, plastic is slippery. I've seen chicks slip and their legs slide apart, putting them in jeopardy of an injury. Full grown chickens are at risk, too.
I realize tons of people use plastic for feeders, waterers and nesting boxes. But I really take issue with our dependency on this material. We choose it for ease of use. It comes with a heavy footprint, though. When you buy plastic, even with a high recycled content, there's no escaping where it came from, what it contains and what's yet to be discovered about the harmful consequences to our health, and where it ends up when its convenience has run its course and we dispose of it.
Just my twenty thousand cents on the matter.
(ETA: I wanted to mention that I started a discussion on my
Brinsea heater that's no longer working properly. It's made of plastic. It's really hard getting away from this material, and I did contemplate PVC feeders at one point. But I say no to plastics as much as possible.)