Just looked closely at amaysim. It doesn't support smartwatches, which is a dealbreaker for me (I use my Apple watch as a phone and SMS & e-mail reader very frequently), but they are saying "watch this space!", so it might be my choice before too long.
Also, they use the Optus network; Optus has been typically much more restricted coverage in Tas, so I'll have to check if they have caught up. 4G Vs 5G will be a bummer, too.
But if the stars align, I'll be there like a rat up a drainpipe!
Yes, I use them, but not useful when I get an e-mail and need to make a call back home from the side of the road in Japan, as happened recently