Very happy with this purchase.  Very sturdy.  No assembly instructions, only one small picture with arrows showing which piece goes where and one tip saying to attaching one piece first.  I did my best, and ended up taking it apart 3 times before I figured out which order each piece should be assembled.  Despite the assembly frustration, I love the item, my cats adore it.  If you purchase this... assemble from the top down, the base is last!