The fail rate at PDT is generally pretty low as they are willing to invest (a lot) extra in candidates if the right attitude is shown. To the best of my knowledge the failure rate for Aussies here is even better in that I am not aware of any Aussie's failing the training and double digit numbers of us Ockers who got through.
These metrics were a big part of my decision as to where to land in the US so to speak as I know some places are regarded as tougher (due the failure rates) and therefore more suitable to people with existing jet time. (Air Whisky comes to mind)
G'day Ralphi