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Only just seen this. Firstly, best of luck with the move, Paul. Hopefully it's all still on track and you got the info you were looking for. A friend of mine did exactly the same thing a couple of years ago and still lives in Darwin now AFAIK. Haven't spoken with him a great deal, but purely from his social media accounts he seems to have taken to it without a problem.
We're currently awaiting feedback from our own application submitted to SA. Similar to Paul, i've spent a couple of periods in Aus - 6 months traveling in 2009 and then a further 12 months living in WA (mainly, Perth) in 2012, but one place i've never been to-date is Adelaide - which is where this visa will likely see us spend a minimum of 2 years.
Again, we've been conducting our own research and are planning a trip later this year to have a look for ourselves, but it'd be good to hear from anyone who has or does live(d) there themselves on your first-hand thoughts.