It went together easily.  My younger cat really likes it.  My two older ones will only lay on the bottom tiers when the sun is on them.  But they are quite elderly and basically afraid to get on anything but the floor!  The only reason I didn't give it 5 stars is that it's a little lightweight.  Luckily my younger cat is very little so it's not a problem.  I would worry if I had a really large cat that it would tip over and the top two levels might not be big enough for the cat to lay down in.  But it's perfect for my situation right now.