I love this cage.  Large enough to house multiple cats with ease.  This was easy to assemble and rolls like a dream making it easy to move from place to place.  The four front doors allow easy access to the cage and lock with a single or double latching . The 3 shelves are very sturdy and allow plenty of space to stretch out.  The bottom tray can be remove easily for cleaning as it has a simple latch in the front to release and remove.  I also used mine for raising 4 abandoned 4 week old kittens that I was hand feeding.  I just added a box for cuddle sleeping.  I tied to the shelf so they wouldn't knock it off.  I would highly recommend.