Pros: only one usable in a rv, adjustable size
Cons: covering not very cat proof
purchased this from air force exchange for use while traveling in our class a RV. its adjustable for size with a spring loaded top also by leaving out sections. the only problem with it is the covering is not to cat proof, i fixed this with 4" PVC pipe covered with rope over existing tube sections my 6 cats just love it and one weighs in at 22 lbs. they do not use it when we are driving, only while stopped.
highly recommended for cat lovers who take their cats with them in RVs.