I have a small kitchen with a 4 foot wide 13 inch deep inset in one wall.  I thought about building shelves for kitchen storage but saw these and decided to try them.  I'm glad I did.  At 12 inches deep, they fit perfectly and are quite sturdy.  The assembly was more involved than I wanted but reasonable given the type of product.  The instructions could be a bit clearer but they are clear enough if you read them carefully before you start assembling.  The shelf material is not my favorite but it is tough and rigid and I believe the marketing claim about how much weight each shelf will hold.  The only thing that puzzles me is why the wonderfully diverse people in this country can't seem to make a product like this at a competitive price.