I've been there 4 times since they opened for business. I have tried 4 different meats and topping combinations. Steak is my favorite and is better than both Qdoba and Chipotle. I talked with manager to find out what they do to make their steak stand out. He said that they marinate their steak overnight and grill it with some additional herbs and spices.
Among toppings, Guac is extra but most Mex-Chains charge extra. Again, after talking to the manager, I found out that Guac is free with Veggie entries and is extra with meat entries. Compared to Chipotle, Guac is 39 cents cheaper and is fresh and delish.