These are cute, but take more than 10 minutes to install if you include the measuring/leveling.  They are also particle board although the description makes it sound almost like real wood. 
 We had zero studs behind this and although it's like ...16 screws so they are confident that it's sturdy even without a stud ours seemed incredible wobbly.  So we ended up buying anchors for a few of the screws per shelf.  One of our shelves also came with a corner damaged.