I bought this for one of my three cats who loves to be up high on things.  She LOVES the tree and uses the top two ledges the most.  The hanging cat toy lasted all of 10 seconds before Inky bit through the string.  We replaced the string with a lamp pull cord and that works well for hanging a toy for Inky to play with.  Our second cat is now taking an interest in the tree and is working out which one gets the top ledge with Inky.  The tree is definitely big enough for two cats at a time.