If the base is AKL then ok, but Fiji is fairly politically challenged in recent times.
I'd check the pay - if you are being paid in ££'s then ok, but the NZ$ is very weak.
Auckland (well much of NZ) is great to live, but as a JAFA (just another f'''ing Aucklander!) you'll pay the highest prices for property, but nowhere near what you'd pay in the South East (a friend has just bought 5 beds, good area £100000)
Climate better than blighty too!