Best burritos I've had in Canada, for sure, and comparable if not better than things I've tasted in Austin, Texas and Los Angeles, and at $6.99 for a huge burrito, the value for the money is tremendous. I've been twice now and I think I prefer the barbacoa to the carnitas, but both are fantastic, as are the homemade tortilla chips. The homemade guacamole is so good that I suspect it should be illegal.
Forget M4 and stop lamenting the lack of Chipotle locations in Montreal; this place is in a completely different league.