By myself it took me roughly 2 hours to put together; Mostly because I am rather short. After 6 months of having it, the only thing that is a 'problem' is that you need to tighten the posts every once in a while. My cats absolutely love this little vertical abode! 

Pros: tall, sturdy, fits in  a corner, lots of laying space
Cons: You need to tighten it every so often