I have spent hours trying to get the 5 shelf unit to fit together. The two 4 shelf units fit together easily. But the taller one I can't get the two side pieces to fit together!  Each pole fits the the one its supposed to, but you need to get 2 to fit together at the same time and they don't! I've taken the 2 sections completely apart to try to fit the side sections together first, but they still don't. Certainly can't use it as it is. The 2 smaller ones are fine.