We've had food from La Finca on a couple occasions. Id never eat in the restaurant if I could help it - its always full of kids screaming or at least that's what we've seen whenever we go in to pick up food.
Its cheap but then again you certainly get what you pay for. The food will do if you're really hungry but in Katy there are a lot of places you'd be better off getting food from. Whataburger or Chick-fil-a would be good examples.
Last time my husband and I ate there the food was not even worth the cheap price we paid. We'll never eat there again.