I was impressed by the solid feel of the shelves - they are heavy-duty - but only laminated.  I was prepared for the waves to be plastic after reading other reviews.  It seemed like the one screw per wave would not be able to hold up the shelf, much less any additional weight. They wouldn't have been able to if I used the anchors supplied in the box... We replaced the anchors with some of our own that actually held in the drywall and the rest of the installation was a breeze.  The shelves fit snugly inside the waves and look beautiful on the wall.  Happy with the purchase - just wish the anchors included weren't so cheap.