A lot of people are amazed by this restaurant because some of the Japanese food they offer isn't found elsewhere in Montreal.
This place is good, but be careful with the hype, it's not amazing. Should you find yourself in the right disposition, a Japanese mom will easily cook advanced figures around this place.
Bottom line:
If you've been to Japan, you'll think it's nice but maybe not worth waiting in line for unless you're getting unstoppably nostalgic for their fast food.
If your knowledge of asian cuisine begins and ends at general tao, feel free to be amazed.