So I just purchased the Invisible Deck DVD with Justin Kredible. Before you ask, yes I knew how it worked before hand, no I don't think I wasted my money. Anyways, my biggest issue is that some of the cards refuse to cooperate. The keep slipping out of their pairs. Is there anyway to prevent this? I am still relatively new to the deck so more practice will help but sometimes just setting the cards down causes them to slide out of place.