Just make sure you get everything in writing. But I guess that applies to everyone these days.
There have been instances in the past with this employer of Casual Instructors having their students taken off them and given to full time instructors. Thing is, the casual guys were the ones that went back through the in-active student file and got these students to come flying again...
If you get offerred a job, make sure its full time and make sure you see it in writing before you pack up the car and drive to Canberra.
Just my two cents
j3