My kitten is getting TONS of enjoyment out of playing with the bell balls that hang off this item, and he's used the scratching post a few time. But here's something you need to be aware of: this unit is extremely light and it WILL tip over, possibly onto your cat, if you don't weigh it down somehow. I found that out the hard way: it fell onto my cat. Fortunately it hasn't stopped him from playing with it (he's at it right now, in fact), but please be aware of this before you let your cat play or climb on it. It assembles easily, and I'm sure it attaches to the other modular pieces just fine, but on its own it will tip without weight or anchoring of some sort.