I did not like the manual because it is just an image not detailed enough for my taste. It takes at least 1 hour to mount it in full.
Important: Tighten the screws to mount, otherwise if your cat will ascend to the top, its going to shake a lot and it may not feel at ease.
Do not have a big / big cat. My cat 4 years old and weighs about 6kg, it does not fit his whole body into the shelter the top and the body than enough when she lies down on the trays.
If you have a Maine Coon for example, do not buy this particular cat tree :)
Overall I'm pretty satisfied.