I make a model to compete with that Chinese aluminum feeder. Called the MA 2017, Marie Antoinette, our ad tag line is if your birds can't live like royalty they can at least die like royalty.
Ours cost a bit more because I thought we needed to fix the problems inherent with the design. The wide treadle of course, too close, too easy to overwhelm with a few rats, too close so it allows the rats to stand on the treadle and eat once enough are on the treadle. Aluminum will be chewed through once the lid was heavy enough to actually keep the rats out, which is fine as a rat can just push the Chinese models open to eat. No need to chew a hole. Then the small screws holding the treadle linkage together do tend to fall off. Check the
Amazon reviews, very common last I checked. The treadle is flimsy, a small child can bend them by hand and after a few weeks the medium and larger breeds will have the treadles bowed and bent and bottoming out. The birds will rake feed out like mad so the sellers recommend filling the feeder to one quarter to one third capacity.
The fix was to use galvanized steel instead of aluminum, a heavy steel flat bar treadle, narrow treadle step back far enough to stop rats from using the treadle, 1/4" bolts with lock nuts instead of the tiny screws that hold the treadle links together, and a solid 3/4" thick wood step that even a human can step on without damaging the feeder. Then I extended the length of the lid in front so that there is enough weight that a mouse couldn't push the lid open. We added a front lip to cut down on billing feed but we also recommend filling the feeder to one quarter to one third capacity. You aren't gonna get a good feeder that saves feed for $39.00, better to save up and buy a good small feeder for $21.00 more in my opinion.
Downside to our fix, that light aluminum lid isn't likely to kill a full sized chicken if it hits them on the head. If a person had emotional support chickens, then I wouldn't recommend our MA 20017 at all. We have a saying in Oklahoma, livestock is never 100% safe around moving equipment or Oklahoma State Senators. The risk is small but there is a risk with all of these guillotine style feeders but there is also a market for a cheap feeder.