I had three different plumbing companies tell me that I had a break in my drain line and 2 used locating cameras. Melvin came out and before he even used his camera, he said he "thought" he knew the problem and it wasn't a break in the drain line. Melvin was correct and it saved me over $10,000. A friend recommended that I call S&D 2 days before I was going to go through the tunnel under my house. Highly recommend. Very honest, straightforward and professional company.