These things were the best value ebikes - I've got one too. Perfectly sorted, absolute blast. No new ones available in Aus anymore (superseded), although there may be some of this lesser model still available from 99 bikes:
www.99bikes.com.au/merida-eone-sixty-500se-41cm-silk-titan-black-2020-1Some tips in no particular order:
use your local bike shop - they do go wrong and are less amenable to home maintenance- - warranty is usually two years
look at Merida, Giant, Trek - the eReign is a nice bike and I liked the grunty Yammy motor (For the Riders had a good special on last week)
Specialised are expensive for what you get and the Brose motors crap out with great regularity (but they are good for warranty, just delays is all)
demo, demo, demo
go aluminium imho - weight is less of an issue and it's way more robust
check out bike exchange on the net, also fb pages like E-BIKE Australia
if you are buying second hand remember the batteries lose capacity with time - particularly if they have been stored at 100% (I store mine at 50% and only charge up just before a ride) - you can check batteries with the app usually - so ask to see it.
Enjoy the hunt.