This is a pretty legit Mexican restaurant for Montreal. I had walked by here dozens of times before trying it because I wasn't too sure what the deal was but I have to say that once I tried it I was pretty happy that I had.
It's nothing fancy but the atmosphere is pleasant inside, the service is really friendly, and the food is solid. I don't eat meat and they were out of the shrimp quesadillas the night I went, so I tried some cheese and potato hard-shell tacos, cactus quesadillas, mushroom quesadillas, and the avocado soup. Everything overall was simple but quite yummy (especially the soup which was excellent).
I don't think they serve booze but they have a fun selection of Mexican staples like guava juice, lime soda and aguas de Horchata and Jamaica which is nice.
I would definitely eat there again, but I would be more inclined to return more often if they had a better selection of veggie/pescatarian dishes (re: fish tacos). But for you meatatarians out there, I'm sure you will be plenty satisfied with their selection.