I rented a Nissan Tiida old model for a 10 days trip at Omega Rentals Christchurch. Everything went fine. The car was in good condition, is was by far the best cost/benefit I could find, much cheaper than in Sydney, the service was easy, the transfer to the airport quickly. They took a deposit allowing my 19 years old daughter to be the second driver, and I got it right back. Five stars