"Free" alarm systems

Watch out for a young man that is going around talking about putting in "free" security systems. As most of you, know you do not get anything for free, the system is free, but the monitoring is quite expensive. Is what is being done is they are dropping names saying that that person is very interested in getting the system and that person is very happy with it. One of our neighbors did a lot of research on the company's and ended up backing out of it completely. There is one company that puts the system in, then you sign a five year contract with the second company, and that's the one that will get you, so please be on the guard for them, thank you.... Dave