I like to go for the people and satellite events, but Defcon itself is very poorly run in my opinion. It is insanely crowded to the point that most of the time you are just stuck in a sea of people. It also continues to get more and more expensive. The talks are nice, but it's tough to curate which ones to attend because that often requires getting in line early for that talk so you end up with a limited itinerary. Cost of admission is increasingly starting to feel not worth it and there is a lot to dislike about vegas which seems to amplify a lot of the worst things about America. Having said all that, if you've never been before, you would probably have a good time the first time around, especially if you are a little bit outgoing.