We had to queue outside the restaurant for around 20 minutes but it is worth the wait.
My wife and I both ordered ramen as it is what everybody raves about. This was the right choice. My katana-ya special ramen was great as it had a good selection of meat in it and the wife's deep dried chicken ramen was good also.
You may be tempted to order appetisers but I would say order your ramen first and see if you have room for more afterwards. The ramen bowls are huge and I saw a couple of bowls go unfinished from people who ordered sushi for starters.