spouse contributions

I have been doing some reading on spouse contributions.
Can someone with some smarts please confirm that my conclusion is correct.

I pay $3000 of my after tax income into my wife's account (she has no income)
I then pay 15% contributions tax on this $3k ($450)

My personal income tax is then reduced by $540

Does this sound correct?

Is there a better way to contribute to my wife's super? I am PAYE

Thanks