Worth buying if you like the coins and want to collect them otherwise not worth buying for precious metal content.
Thanks for your kind reply. I saw someone mentioned in Gum tree that the market value of the set is A$250 in Greg Mcdonald 2014 book. I also saw the silver set was auction for $150 in Downies auction.
If you can get it for $150 then it is definately worth getting. Nearly same price as a bullion coin for numismatic coins, then it is a good buy.