It's far away, and as a developer I don't think you can earn as much as you would in the US. Certainly to be more HN specific, the startup scene is not much to talk about.
I was interested in migrating to Australia for a while, mostly because it's closer to where my wife's family lives. But it's just so expensive to live in Australia and the pay scale isn't nearly as good as the US or UK. On top of that, they have so many barriers to getting a skills visa it's just not worth it.