Used these shelves for about 8 months now. I bought 3 and installed 2. One of them had the bottom detach. Luckily I stacked them originally on top of one other, so I was able to prop the sagging bottom with books against the other shelf. But it's obvious this thing has a problem and can't be used. Giant holes in the wall are needed to install them and now I can't even take them down since the wall and wallpaper is damaged. Awful.