Such a great style, I love the look of this shelf.  The only drawback is that there's no way to secure the shelves to the frame, so they're very easy to accidentally nudge out of place.  My concern is if they're nudged a little too much, the entire shelf will fall but thankfully that hasn't happened yet.  Probably a good idea to make sure this is hung up high on a wall and there isn't too much putting on and taking off of stuff.