Be prepared for long wait times. I did read a few reviews which advised this but i had to wait for almost 3 hour before my number was called to speak with an immigration officer.
Other then that the process was very painless. The officer asked me 5-6 standard questions (How we met, when we last saw each other, when we are getting married etc) and then sent me on my way. Unfortunately i did not have the correct New Zealand police certificate so I was asked to submit this and once they had it they would approve it as long as there was no issues with it.
I arranged for the correct certificate to be sent in and i received notification about a week after confirming my visa was on its way.