I have the same question as you as I am interested in upgrading my NEX-C3 to an NEX-5R or NEX-6 this Christmas and their prices are pretty attractive. I haven't had any personal experience with them. But a friend of mine bought an NEX-F3 kit from them awhile ago and sounds like everything went pretty smoothly. She only said the shipping was a little bit later than the 3-5 days shipping they claimed, but the product is great and the price is as listed, no other extra fees.
From a brief search on this forum I find another thread about this website and seems like they actually ship their products from Hong Kong:
so there will be some delays to NZ. Typical international dealers I guess.
Hope this helps.