Easy-ish to put together - some of the rods in the house boxes were a pain. 
Great tower that the cat loves, but like others have said, it's on the small side to support an adult sized cat. (Fits a 6 lb dog just fine)
However, she uses the "if I sitz I fitz' principle. 
And it's a great escape for the cat to get out of reach of her 2 annoying doggie sisters.