I've been here before and have had long wait times, passed by numerous times only to walk on because the lines are so long.... but one day a colleague and I popped by during a weekday lunch to find it pleasantly vacant!
(If you can get in) expect cramped eating areas, but friendly service and good food. Haven't had ramen this good in the GTA. The noodles don't taste like they came out of a package (but who really knows, I'm no savant), and the broth was smooth and flavorful. Came in after I was sick for a few days for a small simple meal and ended up finishing it because it was so good. Downgraded to a small portion size and was still satisfied by the end.
Will definitely return (if the lines allow)!