We recently purchased this Double Unit cage for our daughters' 3 pet rats.  It went together rather easily.  The cage was very sturdy and well made.  Our previous cage had bars with spaces that were too wide so we had one continuously escape.  The width of these bars is much better and no more rats on the loose.  Our only criticism is the litter pans are very shallow and litter gets easily kicked out of the cage onto the floor.  Also, the cloth covers for the ramps were instantly chewed and eaten after one night by our rats.  Other than those 2 minor things, this is an excellent cage and a very good value for the money.