You never want to get an opinion about the performance of the foundation from a foundation repair company. You want to get a structural engineer that is not affiliated with any of those companies either. He gets paid the same amount if there is a problem or not. It usually runs about $300 and is not bias. Well worth the investment.
I am not familiar with the Lufkin market to refer you to one, I am sure that another pro here will be able to help.