I used to have a hobby farm in Griffin. About 2.5 hectares. That was 10 years ago.
Griffin mostly rural, but slowly it is being developed. I hope you have a car. Being 24km from Brisbane, it'll take you about 40 minutes to the city on a good day. Forget about public transport, there are only buses and they are so infrequent, and they may not even stop near your development.
I probably wouldn't live out there in the burbs (there are other better 'outer' developments that aren't quite so far out or isolated that you should look at), though if you like being isolated, it may be to your liking.