Overall, this is a good product, but it does have a couple of flaws. The basic design and construction is very good. The unit is sturdy and stable, and the bins rotate freely. I have had mine over a year now, and I agree, the catch mechanism does tend to rust and jam, and definitely should have been made rust proof. By definition, the environment for the catch is going to be damp and corrosive. I fixed (sort of) the issue by spraying the mechanism with WD40 when needed. So far that has kept the catches operating.
The other issue is the locking pin. The one on the right just snapped!. This is the bin I use for kitchen scraps, so it got much more use than the other one. In the kitchen I collect organic waste such as peels and cores in a counter top container. When it fills, I empty it into the compost bin, and rotate the bin a few time to mix. I usually stop the bin by letting the locking pin re-engage as the drum rotates. Apparently this is too much for the pin to withstand.