My family and I travelled to Tasmania for the first time in July this year. On one of the days I headed off to Southwest National Park and on the advice of other forum members, I completed The Needles and Mt Sprent walks.
Here's a blog post of my experience: http://travelwithpete.com/?p=480
In short, it was absolutely amazing and I will definitely be returning to do some more walks in Tasmania in the near future