Hi Clint,
Welcome to the forum.
The search function on here is really good. Punch in Gold Bug 2 and you will come up with all sorts of posts. Detectorprospector.com is also pretty good - search function there is good and Steve (forum owner) uses and has written HEAPS about the gold bug 2 over the years.
I've never used a GB2 but am led to believe that they can be a bit finicky in hot ground and better for an experienced operator.
The SDC 2300 is great in hot ground, very sensitive and very easy to operate. Or maybe wait and see a few more Gold Monster reviews to see if they are going to handle the hot ground in Australia well enough to be user friendly.
Good luck :Y: