If you are an aussie resident invested in gold etfs I think is safe to say that if you have the globalx gold etf (GOLD) you should sell it and buy the Perth Mint PMGOLD instead.
1 You don't to be caught in the London paper gold deal.
2 Lower Fees.
3 You can easily convert in actual bars and custody at Perth Mint or request delivery (not 100% on the delivery side).
4 You have the aussie government backing.
Between these 2 YOUs I prefer the Perth Mint one by far.