Another thing to keep in mind is Supero is not actually an NZ registered company, so it really might be a bit of a crapshoot making them fulfil their obligations if they decide not to.
It sounds like this is a case of they are good to deal with when everything goes well, but YMMV when things don't go well, especially when it sounds like it wouldn't be the first time they have given someone the run-around. At least with PB Tech, you have multiple methods of escalation, including an active community member here in the forums. But, if you are comfortable wagering your 1500-1600 dollaroos against the risk of being on the hook if things turned out bad, more power to you.
I think the $1649 for the 8GB/128GB 8 Pro + headphones is pretty reasonable, all things considered; its a shame that it wasn't in the mix earlier when I had to make a decision. But then again, I'm not really interested in WarpCharge either, so it would be no great loss for me.