I have 3 cats over 7 years old - 1 big boy, 1 medium female, and 1 small female.  I was hoping for a cat structure they all would be able to enjoy.  The material is very soft, and my cats like being able to lay on the ledges and perches.  My big boy likes the bottom box.  I used catnip spray to help them get adjusted.  The structure is very easy to put together (I would suggest 2 people).  Shouldn't take any more than a half hour.  The pictured instructions are very easy to follow, and I love it comes with the tool you need to put it all together.  Overall I'm very happy with this purchase, it is made well - I think it should last a long time.

Pros: very soft, bottom box and first ledge is roomy enough for a large cat
Cons: 2 stand alone perches could be a little bigger