It depends on what type of shop you are. In my workshop experience getting the bottom-bracket re-threading tools was not an every day occurrence. When it did come out it would typically be for one of the early cr-mo mtb frames where the bottom bracket was just a tube, i.e. not investment cast, although it would come out for those too, e.g. age old Raleigh bikes.
I do know of a high-end shop where they seem to use the tool on pretty much every high-end frameset build. (As if the likes of Look etc. don't bother to thread the b/b...) Clearly they are getting a better return on the tool than I was.
The tool I used appeared to be of the Hozan flavour, it pre-dated my employment and had one of the handles bent.
Availability is going to be a problem in Australia, I would just get what one of your favourite distributors can do for you at a favourable price. If it turns out to be unfit for purpose then you can return it. I would be very surprised if there were any on the market that were sub-standard, i.e. less than bulletproof.