I can only say that since I bought my home 3 weeks ago ADT had knocked on my door 4 times trying to sell me a system. I am not interested in purchasing a home security system, but if I were, I don't think I would use ADT simply because I know feel harassed by their salespeople.I even have a "No soliciting" sign on my door that they ignore and knock anyway. I work long hours and have little home time. I do not want salespeople at my door. PLEASE ADT LEAVE ME ALONE. Thank you.