I recently ordered 2 of these bookcases and we assembled one of them yesterday.  It probably took us about 2 hours and we figure it will take a lot less time to assemble the second one since we are now familiar with the pieces.  The bookcase looks fantastic!  I'm glad we went with the slant back look and extra height.  It's just a little different from your standard bookcase so adds interest to the room.  I've ordered their items before and have always been happy with the result!