Are you looking to work for them ?
If you are adventurous then go and work for them. It all depends on what they are offering in their package, not just money but medical cover, safe secure housing, transport, flights home etc.Tax is around 35%.
I do not know of any Oz expats who work there. It seems they only employ TCN's as they are cheaper than other expats.
I am not in PNG now and have not worked there for a few years now.