i havent but i will say i bought a guitar from australian ebay and its great so it might be worth making sure u cant get one from australia before u try and get it from the US. Shipping only took about 2 weeks for me
Fender MIA Stratocaster (Sunburst)
MI Audio Crunch Box
Yahama FG730S
If you get a friendly seller to mark the delivery as a "gift" you'll evade some tax costs
I had mine shipped from America through Ebay.
I didn't have to pay taxes on mine, and the shipping took around a week.
ye i had my schecter shipped from america, no taxes paid.

ask them to declare the guitar value to be under $1000.
I've had an agile guitar shipped from US and the person was kind enough to put the price at $50 and say it was a gift, that way I didn't have to pay any customs charges