I have never owned a pair, but I have tried them on in the store a few times. My impression is that they run large-not particularly wide, but a 42 was more like other brands 43.
Are you talking about the one's with all the airholes in them (Aerator's?)? If so, I wonder if the climate in Melbourne (I live in Melbourne as well) suits them? Unless it's summer, I would imagine you'd be putting shoe covers on them all the time to stop your toes freezing.