I don't want to let my two cats run around loose outside because we have raptors flying around. I actually had an American bald eagle in my yard! So, in order for them to have a bit of time outside without fearing for their safety, I bought this. SO easy to set up; folds small for storage; very sturdy. I like that half of the top is screen so they can watch birds fly by. Also, the little pieces to drive in to keep it from moving are a great idea. Before it snowed this month, I took it apart to bring in and it took me less than 10 minutes. The metal seems to be well sealed so it won't rust. I can easily move it when the yard guy comes, too, because it's not as big and ungainly as a \"catio\" would be. The boys love spending time out there...but they'd love more to be loose so they could chase birds and squirrels!