These bookshelves are very cute, nicely manufactured, superbly packaged, at a fair price.  Very quick and easy to assemble and install.  
Downsides: Although the shelves have a nice, heavy wood weight to them, the top layer doesn't appear to be a real wood veneer.  But with this minimalist style, one probably wouldn't notice or be bothered by it.
Also, some of the individual shelves wobble a bit, but should nonetheless hold quite some weight.  We bought three of them and mounted next to one another for a big display wall.  Would definitely buy again!