This is a very personal opinion: I'm not encouraged.
I have been following it very closely. You can do that without spending the jet fuel and going there. There is enough on the web. I feel for some of these people, because they've been in almost continuous negotiations now for two years. I used to be part of that process, and I know how quickly you become almost brain dead from it. You don't eat properly or sleep properly or drink properly.
If you look at the status of the negotiations at the moment, you'll see they're certainly not that encouraging. There have been some interventions recently that have been encouraging. I mentioned the one by the Chinese premier in New York a couple of weeks ago. Japan has increased its level of ambition. Norway has done likewise, and so have many of the European countries. So you're actually seeing some countries now raising their level of ambition. But there are still some very tough issues that need to be agreed upon, and as they say in the U.S., for the negotiators, it's way outside their pay bracket. These are issues that can be resolved only by national leaders. They are such things as the level of ambition of the industrialized world, and the level of financing for developing countries to address climate change.