When the box arrived, I thought first: wow, is great! Then unpacked and set up quickly fix (also is very simple, even without instructions enclosed) the round window boxes are partially die cut so that they can be put together and used as balls. The skylight is somewhat unstable through the only plugged 2 cardboard pieces, but there also nothing happens when it falls sometimes. Hardly was built as the home, also was already the first cat in it, and the second before and it was gepfötelt wild. So far, the house will gladly and often used by both boys and also looks nice. Probably the carton will not hold for too long, since cartons are shredded like here, but as long as there is a great stuff which we will buy new again and when required.