Van Gough,
GAM are mainly a freight operation, with a bit of charter work out of Cairns and Weipa. Most of the work is 'split shifts', flying a leg out in the morning, spending the day at an outer port, and then back in the evening. Most flying is Mon-Fri, with the odd weekend flight if you get a major city posting. And as discussed earlier is a great way to log your IFR time.
The machinery is really good for 'GA' aircraft, although they do have the cleanest MR's in Aus which is something to be weary of. It seems 'new' turbine aircraft are arriving every second week so it would be a great time to get in.
I'm not sure how things have changed since the Bossman passed away, but by all accounts they were a great bunch to work for back then. As long as you do the right thing by them, they'll do the right thing by you.