Do not trust is outfit on anything; costs, work quality, or schedule.
They were paid upfront to locate a sewer line; they failed. First they delayed the entire project for two weeks by not showing up for work as promised day after day. No reason was ever given.
They distroyed much of our driveway without location the sewer line and then wanted another ten thousand dollars to actually locate the sewer line. Their plan included distroying more of the driveway plus the front yard landscaping; with no garentee that they would find the line. They were my big mistake.
Recommendation: No plummer is much better than this firm. Avoid at all costs.