Box was very heavy. It took me about 1.5 hours to assemble, and another half hour to sort out parts and screws. Worth the time.
It would have been very helpful if the manufactor had mark the parts with the LETTERS to match the pictures.
 The tree is very impressive, and sturdy. I know my cat will enjoy it.
I recommend this product to all cats. Nag your staff till they get this tower for.you.

Pros: easy assembly,  goes together rather quickly.
Cons: Instructions could be clearer, Parts could be marked. comment on  checking tighting bolts every sp offten