I bought the Deluxe Pet Pen for my 2 cats who love to go outside. My one cat really likes it but the other one doesn't want anything to do with it!!! The pen is easy to open and folds back nicely for easy storage. Its great with screened windows all around for nice air flow! 

Pros: Very easy to assemble.
Cons: The material has a funny smell to it, I have been airing it out every day!