This system is okay but it does feel cheap and the construction is flimsy.  I actually reinforced the sides with screws and then when I stacked them I screwed them together top to bottom to hold them together.  I have no doubt that the material itself is strong, just not a great way to construct them using only double sided tape and a few dowels.  I needed something I could build up to a certain height so the fact that they come in different heights and sizes is great for my purpose.  Am going to have a counter top installed on top for additional shelf and storage for my laundry room.