You may have to be the guinea pig Branchie. -;) With a new lithium battery model now appearing at least weekly here in NZ I am guessing the same applies in Australia. Until a particular battery model has been on the market for a year or two and in use by an owner for a similar period no one can possibly accurately report "life span, value for money, any issues etc" details. Only time will tell. "Just purchased and they work great" would never cut it for me. I can report that our 4 cell Sinopoly 300Ah LiFePO4 battery pack is still performing perfectly after 7 years of full-time travel. It starts the truck and powers our house behind.