I purchased two of these shelves after being somewhat skeptical of their ability to be supported free-floating by the very small knob and hole locks at the back of each shelf. But due to the reviews, I thought I'd give it a try. I had my contractor install them side by side, so as to appear as one unit. It took quite a bit of adjusting and some cardboard shims on one side to even them out, but to my surprise it came together quite nicely. Aesthetically it is clean and beautiful. Functionally, it appears to hold some books and a laptop quite easily. Time will tell whether they remain as solid as they appear. My biggest concern is that if you accidentally bump it from the underside, then it becomes loose. A bolt from the inside directly into the wall may fix that, but I am using it as is for now. This wall shelf is a great solution for the minimalist who wants both form and functionality. As usual, very pleased with Overstock!