When I opened the box there was a strong chemical odor (it also comes with gloves which is a bit unusual) - had to leave it outside for a few hrs to get rid of the smell.  

Assembly was easy.  My cat (who admittedly isn't skinny but under the "supported" weight) decided to sit in the hammock as I was still putting the tree together but one of the legs completely broke off under his weight; I reinforced it with my own nails except the tree is made of cheap pressed wood and only time will tell if it will hold up to his abuse now that it's fully assembled & once I throw out his old tree.   

On the plus side, it's high and he seems to enjoy the top level view, and for me personally I like the clean neutral colors.