I love the case files and dossier, the wax seals on the envelopes and the occasional little surprises. It's the little touches that really make the boxes. I also like interacting with Sullivan via email and the websites. My only 'complaint' is that I wish there were a few more puzzles per box! I like the side mystery of the disappearance, too. All in all, very enjoyable but a bit short. I finish a box within an hour or so.