We have been here almost 3 yrs with our kids and we also really enjoy it here. Some things are frustrating and NZ is not utopia, but where is? People are friendly, schools are good, kids are thriving and doing tons of activities. We, as a family, have a pretty good social life and love the scenery and outdoors over here. We have rented, bought and sold a warm house and back in a cold damp rental but we are building a new house on a piece of property just out of town so it is temporary. Negatives are cost of food, cost of airfares back home and the cold damp houses. But, as a PP posted, there are warmer houses out there(our last one was) and we are building a house that will have double glazing, insulation and central heating.
Good luck!