We have two gerbils and had an aquarium laying around so this has been a good purchase (we have had this about a month).  The water bottle holder is just a strap and not very sturdy so you may need to get a separate bottle holder (we are using a rubber band).  We watched YouTube for better assembly directions.  This option contains the bedding so much better than our old cage and about doubles the space of what we had been using.  We have a mix of paper, aspen and hay and enjoy watching them make tunnels.  The plastic wheel and plastic ball were separate purchases.