Working in the neighborhood, it's become a great spot for a healthy, delicious, and fast lunch.
The ingredients are always fresh and delicious (my fave is the Maroc salad with spiced chickpeas, cucumber, feta, tomato, parsley, and hummus) but I have to admit it's pricey (about $24 for salad and juice) but in line with prices in the touristy area of St. Lawrence Market spots.
The food is comparable to the nearby (and cheaper) iQ, but Evolution has the advantage of much shorter lines (perhaps until the word gets out) and has much friendlier service.