It's been there since the late-80s - I went there occasionally when I was at university the first time round. The place used to be heavily patronised by Japanese and Korean sailors back in the day (it's literally metres away from the docks), and of course now with the huge upsurge in immigration from east Asia, there are plenty of people who go there for a taste of home.
The place has barely changed. There is still the huge pot of stock simmering away on the stove, with mysterious items in it, and a stream of water constantly running from a tap to replenish what is lost in the steam. The cooks are big friendly Japanese guys with not-exactly-immaculate aprons on. The noodles aren't those slippery wriggly soft ones from a vacuum pack, and are cooked fresh every time in their own basket dunked into boiling water. The decor is bare-bones, to say the least, although the early-80s style oddly-shaped wooden seats have been replaced with more conventional metal-framed seats with padding. You can still sit at the bar by the kitchen area, on the benches that have coloured stripes to mark which is your half. The only notable addition to the menu is edamame, because naturally that was unheard of in NZ back in the day. Oh, and cold noodles - must give them a try, since I've liked hiyashi chuka when I've made them at home.
You can get all different styles of ramen, shoyu, miso, Hokkaido style. You can get extra corn, pork, wakame, mung bean sprouts, menma (bamboo) added to your ramen. There are side-dishes, including very tasty gyoza. On the tables are extra soy sauce, chilli oil, vinegar and shichimi togarashi.
If you like ramen, it's the only place to go in NZ. :-) And a great place to get a healthy and tasty meal for around $10 (or a bit more with additions and side dishes). Open 7 days for lunch and dinner!