The problem with a 485 presentation and most presentations on long papers about a wide subject is that concentrating the information is very difficult. With the large amounts of information you become attached to certain parts of it and this makes it more difficult to concentrate it. The best presentations pick a specific part of their overall findings that they know the most on so they can answer questions and they can clearly explain what they mean. I would want to listen about a portion of a topic in a good amount of depth and have answers to questions rather than a board overview of a large topic. Good preparation and delivering the talk in front of friends is really helpful in preparing for the final talk. These are just some ideas I have. I have only seen two sessions of 485’s and I hope to see more so I am well prepared.