The cat tree was easy to assemble and is solidly built.  However, the manufacturers made a mistake in constructing the top shelf. In a nutshell, they reversed the placement of the screw holes such that the opening on the top shelf can only face backwards.  Had they placed the screws in the right position, I would have given this product 5 stars.

Easy to assemble, solid construction
The 'house' and very top shelf can only accommodate a very small cat.  Ours only weighs 12 lbs but still has a hard time fitting into the house or the top shelf