I'm sure someone will be along to correct me, but my observations are:
After native Kiwi's I believe that ex-pats make up the next demographic. Followed by a large Asian contingent. My folks for instance (English and Scot) have at least 6 ex-pat couples as there immediate neighbours. They live in Orewa, North Auckland.
The lifestyle is good: social, easy going, active (outdoor) style. The infamous Kiwi ingenuity is apparent everywhere, i.e. a strong "give it a go" attitude to most things.
Financially I'm can't really comment as I have never worked there, or lived as an adult (I left when I was 16), however typically the wages are a little lower than the norm. Consumer goods are average to slightly above average. however, that is balanced out against cheaper housing, amenities, food etc.
I have had conversations with my stepdad (Scot) who says the economy runs between 3 and 6 months behind the rest of the world...
It's certainly a beautiful part of the world that is worth a visit.
How's that?