Being an Australian, I have selected the Google Australian female voice. It actually sounds more natural than the other selections, including the American ones. It's good for sitting back and listening to long documents or Wikipedia pages. It also allows highlighting sections of text for just that section to be read, making it extremely useful for the fine print in things like the terms and conditions of contests or membership rules, etc.

There are the odd mispronunciations, but in my opinion this is made up for by other enhancements...for example, dates written in US format are read out in British/Australian format. So a date written as March 30th is read back as 30th of March.

It also reads currency correctly. A figure like $123,456 is read out as "a hundred and twenty-three thousand, four hundred and fifty-six dollars"

Very happy with it. Well done to the developers.