We finally put these shelves up and they look great! The tight fittings hold the shelves close to the wall and feel secure. We purchased the longer shelves and the hardware secured to the shelf for hanging are placed well in order to sit squarely on studs placed properly (16” on center). We did use the dry wall plugs provided for one side and the shelves still feel secure. The natural wood in color, feel  imperfections is absolutely perfect and exactly what we were looking for. The depth of the shelves was perfect to fill in the space without protruding to a point that we would be walking into the shelves as we pass by. 
Could not be happier with this purchase.