Has anyone switched to the plastic waterers? I have seen them in magazines. No moving parts but how durable are they?

How do they hold up against a horses butt? Really I like the concept and they look cool but they are more money and I just am not convinced that plastic is tougher than steel.

We have those at my barn. So far so good. I like them, but I have seem horses break the 'lever' use to fill the bowl before.