Overall was pretty straightforward to assemble.  Materials seemed decent and sturdy.  Once assembled I was worried about some wobbling as when a larger cat was on it near the top.  However, since then at least two or three of my cats are on this most of the time I walk by the room it is in, and it seems fine.  Like that it has two cubes to hang in, which are decent in size also.  Shipping was awesome,  even right before holidays.