Perma-pier foundation repair company in Texas (Dallas, Fort Worth)

[Edita D.]

Hey guys!
We are looking at a house in Keller (close to FW, TX) that had a foundation repair done by Perma-pier foundation repair company. Did any of Texas investors out there had to deal with this company?
If no, how do I do research if the company is trustworthy and reputable?

BBB showed "A-", with more complaints against this company in comparison with industry average.
Thanks guys!
Edita