Don't forget Macair successfully operated the 42-500 for nearly two years.
They had C+T help from Mt Cook and a couple of experienced kiwi engineers.
Toll have been operating the 42-320 for longer and doing their own maintenance, so really this is nothing new.
Although the 72 is a new model to Australia it is the same type (ie 42/72 same type rating) that is already here, we've been through this before here where i work as well.
Good reliable aeroplane.