Very easy to put together, love the width of the column and amount of sisal.  The kitties can really sink their claws in.  Only thing I would change is make each section with sisal a bit taller as my kitties can’t get the tall stretch they crave in between the sections.  Would also extend the shelves out wider on each side to facilitate jumping from one level to the next.  Bonus points for stability, anchored to wall and doesn’t budge an inch.  Kitties love chilling on the top bed while surveying their domain.