I've been sick a couple of times from Margarita's, but most of the time I have been fine. This place has fantastic American-Mexican. It's my wife's favorite place, so we go all the time. I usually get enchiladas.
They have a pretty large gluten free selection and the waiter was very knowledgable about their menu and what was ok to eat. Everything's that is ok is clearly labeled GF.
Great GF selection on main menu. Tons of options!