Had an issue at Sci-Fi when they couldnt or wouldnt find our ADR, but when I pulled it out suddenly it wasnt a problem, so I always have at least a copy of them with me, plus I like to make sure I know what were doing when so I put them with a daily itinerary. I made a Tutto ADR for June and the email confirmation never came so I called and got it. Peace of mind if nothing else!