Right now he has about an 8 hour commute, if he takes the Australia job it's a long plane ride.
His schedule now is supposed to be 2 weeks at work and 2 weeks home though that hardly works like that and he usually works 3-6 weeks and comes home for no more than 2 weeks. The Australia job is 1 month on and one month off though we have no way of knowing if that would really work out that way.
One perk with Australia would be that he would rack up a lot of frequent flier miles which can pay for trips to places like Australia.
My biggest fear would be when we get pregnant he would miss the birth. Granted I could go into labor when he's working where he is now but it's only an 8 hour drive or a really short plane ride, Australia wouldn't be that easy.
Torn, he's burned out with the job he has now and wants a different setting but I'm looking at the long term aspect of it and I wouldn't want him that far away if anything was to happen be it the birth of a child or a death in the family.