We have two cats that were indoor cats and then outdoor cats and now they're back to being indoor cats.  With the Colorado weather getting colder we decided to move them back in.  Our only problem was we have nice leather furniture and I was worried what to do with the cats.  This pen was the perfect answer.  It went together in just minutes.  It's strong and sturdy and has plenty of room.  I didn't want it to move around so I didn't use the casters.