I've only ever eaten at JitB very late at night when they were one of the few things still open. (This was when I lived in San Jose, CA).
But, I never got Tacos from them. The one I went to was right next door to a small Taco joint called "Taco Taco" and thier food was really tastey (in that super unhealthy kind of way.)
I even learned their secret lingo at Taco Taco, so I would just order a "Green Bean", which was a bean burrito with spicey tomatillo salsa. The things weighed about 2 lbs and cost something rediculous like $1.50.
-walker