Easy of construction was great - check yes.   Overall appearance is: just way too cute.  Compliments and where can I get one have been many.    
The main reason no 5 stars:
The overall unit is designed more for smaller cats or kittens as the openings from one level to the next are just to small for larger cats to get through.   Problem solved by enlarging the opening.  
Now I do not have it out doors and truthfully don't think it would be that great outside unless it was protected from the elements.  The one I purchased is in my cat's play room (screened in porch) an they do use it a great deal.   I do keep the back door open on the house for ease of entry by my larger cats.
Overall my cats are happy so I am happy.     


Pros: ease of construction
Cons: openings are quite small for larger cats