I am very happy with this dog pen thus far. It’s only been 3 days but it is just what I needed to give my puppies a space to run around. It was extremely easy to assemble (only one person needed). Additionally we do not have a flat spot in our lawn but I was able to install it even with the change in grade. 

The other reviews I read are correct, it not a heavy duty product but it does the job. I haven’t had it installed long enough to comment on the rust.