Bought this for my son's two male cats.  They live in a small apartment without any evidence that cats live there.....until  now.  My son had no problem putting it together.  Afterwards, he placed the cat tree in front of the picture window.  Right in front of this window is a huge tree with a squirrel and various birds.  The boys love watching all of the action. 
They love it!  This cat tree gives both of them high perches to sit/lay on.  They spend almost every minute of the day up in their tree!