I think these are better than others that I have seen. I have five of them, three of which belonged to my Dad and Grandpa. They are probably 10-15 yrs old and can't tell apart from the two I bought a few yrs ago.
There are no distributors anywhere close to me for those feeders so I called and asked about the possibilities of getting set up as a dealer for them. I abandoned the idea, even at cost I couldn't see it being profitable in this area.