Just last week got pulled over in QLD, got lasered doing 74 in a 60 in my i30 hire car...
Was polite and had a laugh with the two officers... Hell when he pulled out the bretho at 10:15am and said "Procedure... had anything to drink today?" I said "Bottle of scotch and a slab of XXXX" with a deadpan stare...
He ended up dropping the speeding fine down to 71 so it was in the lowest bracket for me, half the $$$ and no demerits.
If you pass the 'arsehole/attitude test' when they first come up to you, by just not being a general douchebag, things always go a lot smoother...