When we lived in Kuna we at El Gallo Giro at least once a month. Their food is very authentic and the prices are cheap! You get a very generous portion and if you walk away hungry it is your own fault. I have never had a bad meal there.
The staff members are cheerful and quite funny! I would recommend El Gallo Giro even if you don't live in Kuna.
It is especially fun in the summer when it's nice and warm outside....gives you the impression of small town America at it's finest.... :)