As much as I dont like NBN, i do understand many people will choose NBN over 5G home internet, so anyway First thing first,
downsides
Belong Customer service is very hard to reach, Can only reach them via ticket/emails etc, or Facebook.
Other NBN providers may have NBN 100 ish plan for cheaper, and that may well be worth it (exetel/superloop $68.9)
But these downsides aside, belong is good when
$80 sim credit, which again as mentioned numerous times, people can use it to score double data on $40 first activation, and then continue on the cheapest plan for the rest of the time.
they allow BYOD modem - so $0 cost that way
and no contract or any bonds etc. its all month to month, no locking in, no credit checks.
Then do require you to prepay though from my experience.
You don't like NBN because it's a watered down waste of money? Too late for that. I'm stuck with HFC that won't get updated to fibre for decades to come.