This product is less than I'd hoped for.  There's an error in the assembly as the backing goes behind the drawers, and therefore is never seen.  It should clearly go behind where the books are so there's not a huge hole in the back.  I've rechecked everything and it is definitely a design flaw.  Also the drawers do not slide well on the tracks. The both stick.

All in all, not really happy with the product.  Would not recommend it.