Bests & Worsts Reviews from Amazon

This looks nice, but once the shelving units are out of the box and the shelves are unfolded, they're completely unstable. I mounted one set of shelves on top of the other as you are supposed to be able to do (the shelves have holes and pins to do that). But now the two units sway a full two inches from side to side. Do you want your bookcase swaying every time you bump into it? I don't. Plus, one of the shelf rests on one side is a full half inch lower than the one on the other side. So that shelf is not level, and it moves up and down on the bad side. I have similar folding shelves that are very sturdy and do not rock, so I thought these would be stable, too. My mistake.The main problem is that each unit requires a diagonal brace in the back (or a back panel) to keep the unit from rocking back and forth dangerously, but nothing like this is included. A horizontal piece of wood does not stop shelves from rocking back and forth. Heavy books will NOT stabilize these shelves but make them rock even more dangerously from side to side. I may try to attach a heavy wire diagonally (with a turnbuckle) to keep them from swaying. No customer should have to do this. Please, please keep these shelves away from children or they will fall on top of them. The shelves must be attached to the wall to be safe. And do not load them with heavy books or you risk them swaying and collapsing. In earthquake country where I live, these units are very unsafe. You cannot make a weakly constructed bookcase safe unless you rebuild it. This unit should not be sold as it's dangerously weak.