After living in Texas for almost 4 years, I have to say it doesn't get much more authentic. Food is excellent, portion size is very generous, and being that this is their 3rd location I'd say they have it pretty well figured out.
We've been there on three occasions and the food has been just as good each time. Only reason they didn't get 5 stars was the pitcher of margaritas that we shared was a little weak.
I'd recommend them as the best Mexican in Lake County. I've had the rest and the closest is El Charitto in Wickliffe, but never been as good as this.