I think their quesadillas are the best value. They are like a big soft taco with melted cheese, your choice of meat (or none) and lettuce. I also like their gravy dip.. they have variations on that too.. but the gravy and cheese is really good. Both Tio Pepe's in stockton are great. The one downtown is about a dollar or two cheaper per person, but I like the gravy at this location better.. so they are about the same.
The service is almost always fast, but on rare occassions with the resteraunt is busy.. it can get slow. Its a seat yourself establishment so you can choose where you want to sit... which is a plus for me.
Pros: great food, cheap prices, seat yourself
Cons: slow service (rare), cheap furniture