Very good, but not the best in Madison. Great steak and pork tacos, with the tortillas cooked in griddle grease. Yum. Decent torta though it's covered in margarine. Definitely worth a visit.
The only thing is that this place is really dirty and grimy. It qualifies as 'beyond-dive' in that way, though everything is cooked out in the open and in front of you and seems professional enough. Why not just mop the floors once in a while?