ADT were very thorough in explaining their systems and working with us to have some upgrades, such as the talking control panel, installed. We love it. The system has been working beautifully, and although we've had one minor issue since - the company sent us a cheque to cover expenses we incurred. Very professional and willing to correct issues on their end when they find them - thus the 5-stars instead of 4. We used ADT for 4 years at our last home and were very comfortable in using them as our alarm monitoring company for our new home. Lots of options, too, to monitor the well-being of seniors that may be living in your home. Durham Regional Police also seems to have a good repore with ADT.