Our three cats love this cat condo.  Each has their own space but all fight over the enclosed cubby.  The scratching slide is just the right angle for them to sharpen their claws.   They also play with the balls hanging from the small tree.  The only area that is useless is the round tube as they are too large for it.  Assembly was easy (to put together) but the cats were swarming the pieces before we got it together.