Yep, getting parts in Oz quickly is lousy & J n R are good & there is a mob up Ingham way that seems to be quite knowledgeable on them as well.
From a maintenance pov the engines are pain to work on because their back end is buried so far into the wing. We find we're replacing engine control cables a bit too. Fortunately we aquired some spares from when the Qld aerial ambulance got rid of theirs.
The last 100hrly we did on one the poor owner got a bill for nearly $10k because of the all the things that needed attention. That included a new skytec starter etc. so it was justified, but still not nice.