Great product!  Purchased it to restrict my two cats on moving day.  Roomy enough for a small litter box as well as food and water.  Very easy to set up and take down.  Folds easily and compactly for storage in the included storage bag.  

Now that we're settled into our new home, the cats enjoy playing in it.  For playtime, I roll up both door flaps and leave the top off.

The roof attaches with velcro, and one of my cats quickly figured out how to remove it.  I just flipped the pen upside down on moving day so that the permanently attached floor was on top.  For playtime, I set it up as intended with the permanently attached floor on the bottom, and remove the top.