We are just in the process of assembling the units and were surprised and disappointed at the materials used for the back walls and side walls.  The back is extremely flimsy and we are concerned about mounting the side screws for the shelves into the walls as the walls are 5/8" particle board and the RM0001 screws  are almost as wide.  Also the small white plastic anchors to be installed under the shelves for support are also very flimsy.  Obviously these shelves will not be weight bearing to any degree.  The units arrived very quickly upon order however we don't feel the price of the unit reflects the quality of materials used. Very disappointing.