This is still the best burrito chain in Atlanta, hands down. Lots of other burrito chains are "h i t or miss" (Raging Burrito) or just gross (Moe's). Willy's doesn't have a lot on the menu, but everything they do have is fresh, delicious, and memorable. You'll want to go back the next day. The service is always fast and friendly, and while seating can sometimes be a challenge during the lunch rush (at any location), it's worth it even if you have to take your food back to the office. My favorite is the carnitas with black beans, although they do wonderful chicken and steak. They recently got rid of my favorite menu addition of all time - the mole sauce. Made me cry big tears when I heard that their rich, dark mole was gone forever.
Another favorite of mine is the nachos. Willy's is known for their thin, delicious tortilla chips and they do them right in this monstrous dish with jack cheese, beans, and whatever toppings you desire, toasted under a broiler. My only advice to anyone visiting Willy's: speak up! Don't be bashful about letting the folks behind the counter know exactly what you want and exactly what they're doing wrong. They will start over if they have to, with quiet efficiency. That's just the way they work.
Oh, and try the queso dip if you haven't already - it is really good, some of the best in the city.
Pros: Great food, fast service, good value
Cons: sometimes crowded