That still doesn't really give you any indication on whether taxpayer money on the military is well spent or necessary.
If the defence force says that we need 58 Joint Strike Fighters because they are integral to our strategic air defence and military strength then no one is really in a position to doubt it with any sort of certainty.
I mean the only way to test it is to get invaded or invade someone else so it's not like it's plausible to test the premise that certain bits of military spending are essential.
It also doesn't address the concerns that there were better platforms available at the time this procurement contract was determined that were actually in production.
Is the JSF actually in production yet? The last reports I read on it was that of the two working prototypes one had been crashed and the other was grounded. The issues surrounding the battle systems had also not been worked out.
Given that the Eurofighter Typhoon as an example, could have been already in service for a lesser price and is a battle proven platform. I do not accept the premise that @Runner suggested that it wasn't considered due to range considerations. The Eurofighter group was in Australia to make the presentation when the JSF deal was announced. That says they weren't told they didn't even meet specs don't bother coming. Also consider that the stop gap aircraft, the F18 Super Hornet, that has had to be purchased to cover the forced retirement of the F111 and the lateness of the JSF has less capability than the F111 it replaces and the Typhoon. Now consider the reports today (radio) saying that the government has now been told that the specs of the JSF are being re-written downgrading acceleration and rate of turn as neither engine or air frame performance has met expectations. This whole purchase (along with the 2nd hand equipment) is to my mind tied up with some other factor in the Alliance. Or at least I certainly hope it is otherwise we have reached a whole new level on ineptitude from the monkeys that infest the Parliament.