I bought these 2 years ago and I have to say that they have not rusted and have stood firm in the ground through lots of bad weather.  The only negative is the central lattice work does not screw tightly to the outer frame so a few of them I have had to "boyscout" with twine to keep them from slipping off. 

Pros: Has not rusted in 2 years
Cons: Do not look great close up but does covered with vines.