It was easy and worked just like I expected.  It was perfect initially for inside play time with our litter of border collie puppies.  It kept them confined and my youngest son could go in and out of the door flap to visit.  The attachable floor is perfect for little messes and cleans up so easily - I wiped, mopped  and washed it in the washing machine.

The playpen was also great to put out side (inside of their larger pen).  They could be outside for play and potty training time, and then snuggle up inside the pen when they wanted.  The zipper top was great to keep them extra safe from hawks flying over.  

It would be great to have this kind of pen twice as large for when the puppies grew.