I spend a fair bit of time working down there...5 trips last year.
It's a fairly relaxed pace, plenty of open space, housing is relatively cheap (about 30-40% of UK prices), North Island climate is a little better than the UK but South Island is pretty similar.
The downside is that their economy is in a precarious state and they need skilled immigrants to get it kick started as their own skilled labour trolls off to OZ to make the big bucks.
Bob