A very 'clunky' app to get up and running. Pretty far from click and go it requires your theme to be modified (either yourself if you know how or sending it off to them). I found it made my checkout section a bit cheap looking also, but that could be down to my theme, who knows.
As far as options for Aus shipping goes, it may be the best of 2 evils (the other one requires you to have carrier calculated shipping which is a min of $20 extra p/m).
If your products are many and of varied weights this app could be awesome for you, turned out to be too much hassle for me though.
Support is good.