I've gone with my spanish and latin american friends, and they all say that it's not the authentic tacqueria, but it does the best modern tacos that you'll ever eat. The carnitas alone is enough to shoot this place to stardom, but their other tacos are all delicious as well (I like the octopus and fish tacos, personally).
Hardly any room to actually eat there, which is a shame. But I would gladly stand in the street and drip taco juice all over my hands and shoes if it meant being able to eat here.