I have had as many as 18 Gouldian finches in this cage with plenty of room.  I highly recommend it for the price it is the best buy.  The delivery was super fast. The birds love it.  I currently have 3 pairs with fledglings. It is a great cage for colony breeding.

Pros: Well built, easy to clean and huge 
Cons: Poor instructions, but you can figure it out.