As a Concordia student I love le Frigo Vert. Once I graduate I'm sure that I will continue to love it.
As other reviewers have mentioned it is small so don't expect the same selection you'd find at larger health food stores. What you will find is a quaint, well-operated and well-staffed co-op which offers very reasonable prices on organic food, baked goods, personal hygiene products and the best quinoa I've found in Montreal - so few bad grains! As a full time Concordia student you can take advantage of a 15% discount on all purchases which is also offered to members of the co-op.
The all-volunteer staff is well trained, very helpful and always friendly.
The lounge in the back, while not a place I typically hang out, is a nice place to retreat to and enjoy the company of like-minded people.
Cons: Limited selection