Most of you IT people in Sydney will eventually get sent here by work anyway since the hands-off lectures only costs the employer a day of wages. No real advantages over a video stream and not much networking going on as far as I could tell.
If you like to sleep in and don't give a hoot about the opening presentation then this event isn't for you. Unless the new Darling Harbour venue holds more people or the hype has died down, you're unlikely to get admitted at 10 am on the first day despite pre-registration (and them calling you to confirm). A lot of "suits" usually disperse after the first morning.
You might be expecting a sausage festival but there's normally at least a hipster hamburger caterer and a hipster Asian caterer for lunch (to make developers feel edgy). Most promo t-shirts come in red or black.