The cat tree was very easy to put together, it has a small footprint, not too much space taken up, which was excellent! Soon as I opened the box, my cat was all over it. I couldn't put it together fast enough. The little IQ box keeps her busy. It comes with 2 balls with the bell inside and I see the ones you buy at the pet stores fit in there too. My kitten is 5 months and she loves it. I would definitely recommend it.