I've been looking at some routes, showing SFO-NAN-AKL, both segments in A350 according to Google Flights.

The SFO-NAN-AKL has a 3-4 hour connection. But the AKL-NAN-SFO is over a 6-hour connection!

Still they're vastly undercutting most other carriers, UA and NZ namely.

Apparently nothing linking to Australia from NAN though. Sounds like a relatively limited fleet so they chose to focus on AKL for North American flyers?

There are some good reviews of their A350 business class product.

I wonder if there are good lounges at NAN for UA or Star Alliance elites? Have to have some comfort for 6 hours, though maybe if there are left-luggage facilities at NAN, maybe leaving the airport for a couple of hours may be worth it?