There were all kinds of issues with the electronic tickets on Trade Day, not the least of which was because they changed the schedule for Trade Day completely, and people were attending seminars for which they did not have tickets. They pretty much just scanned everyone in the room 5 minutes after a seminar started and didn't care if it gave them a thumbs up or down. The attendants admitted that it wasn't working correctly and they were just trying to get data samples. None of that gave me any confidence in the system.
But then at True Dungeon it worked perfectly, both with purchased and transferred tickets. So my guess is that they worked out some glitches on Trade Day, and realized why Trade Day wasn't a good first test. ;)