OMG...SUPER EASY to assemble (with 2 people), sturdy and flush base, no wobbling. All pieces arrived, none missing (but lay out and count EACH PIECE with the instructions to be sure!) Fantastic vertical space for our cats, BEAUTIFUL to look at, perfect for a corner window or small living space...ours in in our office between two corner windows. HIGHLY RECOMMEND and wish I had space for another one...LOL! :D