I'm a well traveled person and I ate sushi in both Vancouver and Japan. So I'll try to give the most neutral opinion on this place.
For a Montreal sushi place, it's ok. We came here for lunch, so not that expensive, but we couldn't get every item that would be on the night menu. I.e: no sashimi or tuna for example.
The staff was nice and friendly. We ordered on an iPad which is fun. Everything came to our table very quickly.
Food wise, it's average. The fish had no aftertaste, which is a plus. The tempura was crispy. Dumplings weren't that great, hard dough and not a lot of stuffing. Very small rolls and fish pieces (so lots of rice).
So overall,for all you can eat in Montreal, it's a safe bet. Place looks clean too. Probably wouldn't pay full price for it though.