I won't be attending this year, but I have gone in past years. I have always found the sessions hosted by users to be the most useful, and they always seem to have some pretty good group discussions. Always have at least 2 sessions planned for the same time. If it's not what you expected, don't be afraid to walk out and go to another one. I've found on occasion the session description will sound like a mini-class, and ends up being a sales pitch. If you purchase from 3rd party vendors taht will be attending, find out if they are having a party. Avaya always has the main dinner/party early in the week, and vendors on the days after. Most are by invitation only.