I just finished my GR3 rating in Melb. I had to do the flyt test with a CASA ATO. I have no complaints.
I got asked on all the IR requirements and limitations, a few questions on Aerodynamics and had to give a mass brief on S&L, and pre-flight brief on Climbing and D. The weather forcecast said expected thunderstorms, winds gusting upto 35kts, x-wind upto 20kts. I got told by the ATO that I could do my flight on some other day. I told him, I wouldn't take my student up in this weather, but I will give it a shot. The flight went well n I got through.
I am against the rule that if CASA can't find an ATO to conduct the flight test, the CFI can conduct it. I think the student should wait for a CASA ATO to conduct it.