This came unassembled but was very easy to put together - just a few screws and our kitty was enjoying her penthouse views!  There are at least 3 scratching posts on each level - so no more worries of kitty using the couch corners - YEAH!!! Plus the top level is enclosed which provides her with her own "den" area to hide or sleep in.  After just a few days she has actually mastered the stair/ladder!  This product provides hours of enjoyment and exercise for her.

Pros: Easy to assemble
Cons: None