My wife and I ultimately decided to stop as she became pregnant and didn't want to be as far away from family. That and the flight/quarantine times that would be imposed for our dogs. Another big issue was taxes.
To my knowledge NZ and USA are two countries that will try to tax you wherever you live until you die unless you renounce citizenship. So dealing with being double taxed on income from NZ and USA was a big deal as well.
Whenever I read these articles, it does sound so appealing. My sister has lived there for many years and the quality of life just seems so much better.