I found them to be reliable, thorough, and worth every penny. They are not cheap but they leave you feeling assured that your home is free of mildew and mold. I bought a house that I loved even though the smell of mildew/mold was overpowering. My home inspector told me this problem could be fixed so I bought the house anyway. Kevin was a great help in understanding the source of the problem and how to prevent it from recurring.