I live not very far from Omnivore, so I have been there at least three times over the past year (last time was yesterday). I go there when I want a fast, tasty, affordable, and healthy meal. On the Plateau, that's the best place I found so far to get that kind of meal.
The food is really great; I enjoy middle eastern food for the subtle mix of flavors within simple dishes like a pita sandwich or a salad. I usually have the inca sandwich--I like it so much that it's hard to order something else. They also have salads; the quinoa/green peas and the rice salads are the ones I tried and they are delicious.
They write that their meats are from animals raised locally and without antibiotics. I have not verified this information any further, but I am always in favor of sustainable foods.
The place itself is very casual and cozy: wooden tables and middle-eastern decor. It's not very big, but we never had trouble finding a little spot to sit there.
The one thing I like a bit less is that they don't take credit cards (only cash or debit). This is probably why they can keep their prices so affordable, though.