Bigted, elastomers generally don't thrive in the presence of alcohol, even ethanol (the least virulent of the elastomer solvents), and I'm told most NSW petrol has ethanol in it. Hence how long those carburetors last in Australia probably depends on which state you live in, and exactly what plastics have been used in the carburetor.
That carburetor would not have much potential for sale in the US I think because it does not have either emissions-control features incorporated, or service parts and information available. Its application seems to be for home tinkerers like us, rather than the general public. It would be interesting to know whether the supplier has other models available - probably based on other aluminium extrusion shapes - that could be useful for bringing various vintage engines back to life.
