The Otway fly is a fun experience for something different. As part of a trip along the Great Ocean Road, we decided to visit this place. You certainly cant say it provides a big adrenaline rush, however it is a bit of fun if you havent done something liek this before.
We felt safe at all times and the equipment felt very secure. Its just a nice experience being at the tree top level and moving from one place to another with the support of ropes (and some boardwalks of course). If we had it our way though wed make it even higher and longer and a little scarier if possible.
If you are in the area its worth adding this to the itinerary, but to go all the way there just for this, maybe not.