The door/window sensors (also called contact sensors) work pretty well, but the same cannot be said about the motion sensors; they will detect motion after there’s been plenty of movement (if I walk the hallway and enter a room it will not detect, but if I sit for a few seconds moving in the hallway it will detect it then). This is still not a show stopper for me, as I have a dog and don’t plan on buying any more motion sensors, it will be all contact sensors.
Well, I have not had any problems. This product works as advertised. Video freezes up occasionally but recovers quickly. I did move my router inside the house and went from -61 to -48. Camera resolution is acceptable and the IR emitters work well up to about 20 feet at night. Customer service is good (at least the one time I called them). I recommend this product. ADT installed our system and stand behind their work.

We've begun having an ongoing problem with car break-ins in our neighborhood. I wanted to get a security cam to monitor our driveway. I looked into standard cctv and more advanced poe/hd cams with a dedicated computer and HDD, but hesitated due to the complicated nature of the installs. Not that I can't do that, but I really wanted a simpler option. Enter the Ring Floodlight Cam. I purchased one to install in place of the motion floodlight over our driveway. I am pleased.