Seems to do well pretty well in action:
Collins subs star in naval exercises
Collins sub shines in US war game
The whole Collins class project cost about $5 billion, it went over budget by about $50 million.
The claim that "billions" were wasted is a gross exaggeration. The Collins class subs are subject to a lot of exaggeration by politicians and the press, making it seem like the Collins class subs were some kind of disaster. To put it in perspective, the Abbott Government estimated that the could build the NBN MTM for about $27 billion, but the total cost has exceeded $50 billion. The Westoonnex project in Sydney was originally estimated at about $10 billion but may grow as high as $45 billion. These are fuck-ups hundreds of times worse than the wastage on the subs.
This illustrates a point Bilby made earlier in the thread: it's easy to demand an end to wasteful spending, but it's difficult to accurately identify wasteful spending.
Sinking billions on an outdated weapon
''Australia is locked in to a diesel-electric submarine capability after signing a $50 billion "framework agreement" with French shipbuilding company DCNS to build 12 Shortfin Barracuda subs in Australia. It is said to be the largest, most complex defence-acquisition project in our history.
The Australian government ruled out nuclear propulsion because of: our lack of an indigenous nuclear industry; concerns about maintenance dependence and sovereignty issues if we bought or leased a nuclear-powered sub; and likely public opposition to nuclear technology.
So the Royal Australian Navy was not given the option of considering nuclear power. It would, however, have been cheaper and more practical, because we could have bought a proven nuclear-powered vessel (such as the US Virginia class), without the need to modify it, for about $4 billion each. (Virginia-class subs are designed for a broad range of open-ocean and shallow, coastal-water missions.)''
The Government's "concerns about maintenance dependence and sovereignty issues" are reasonable, wouldn't you agree?
As far as cost is concerned, there's not much difference there. $50 billion for twelve subs is about $4.2 billion per sub, versus $4 billion each for the Virginia class. For an extra $200 million a pop, it makes more economic sense to build them locally and keep some of the money in the Australian economy.
(Mind you, I have to wonder whether we actually need twelve subs in the first place.)