Have previously flown with Air NZ, the experience was excellent and definitely exceeded the service and experience provided by other carriers on the same route (SYD - ZQN).
This time I had to change my flight to a different day, and even though I hadn't booked Flexi tickets, Air NZ made it very easy to do the change online for a pretty small fee.
It was done and dusted in about 5 min, and I was so impressed that I just had to leave a good review. I will be taking Air NZ for all my trans-tasman flights from now on.