Simonc, I'd suggest you talk to a few, feel them out, ask them to address a list of 6-10 questions that are of importance to you. See how knowledgeable they come across, and whether they communicate on your level.
You might even try a multi choice exam on them
i.e.
1.
what's the building setback from the rear boundary on a low density residential property in Brisbane City Council?
2.
what if there's a park at the rear?
3.
I've been warned about combined sewers, but am uncertain what they are....can you please explain?
4.
I've been warned about demolition control precincts. Are there any ways of getting around DCP code, and what are they?
5.
What's a multi unit development site? (MUD)?
6.
Give two reasons why rates might come down, and go up.
7.
What's the growth rate of Brisbane, and how much is natural increase versus interstate migration, versus overseas migration?
8.
Where do new migrants tend to look for property?
You might find a BA who is good on his local area, but you ideally want one who understands the town plan, intended zoning changes, development process, low and high end burbs equally, and the Qld auction and contract process.
Further, I prefer to use a BA who understands the macro and micro side of things. How else can they recognize fair market value and potential otherwise?
You want to avoid at all costs, a person who calls themselves a BA but is trying to sell property within a couple of new developments. That is not a BA at all, as others have alluded.
Good luck with it. Years ago I wouldn't have used one, but certainly would now, due to the sheer amount of time and energy and historical perspective required to buy well. In fact, I am happier to pay BA comm than Sales agent comm.