My guess is you could get a "Lock Right" within $25 of the cost of the Aussie and lots of trail mileage on them out there. I am NOT dissing, the aussie but just thought I would mention that in passing.
From the 3 or 4 LRights I have helped put in, they are dead easy to do too. (Aussie is basically identical so it should be super ez install too) Concept is fairly simply, unless they are using "crap" metals to make them with I would guess the Aussie is "as reliable" as the Lock Right, etc.
Sam Hinton