We rate ADT 4.25 out of 5. It's a well-known and reliable company that has been in the business longer than any other home security company. Because of its reputation and reliability, this trustworthy brand will be sure to make a potential home burglar reconsider breaking into your home when they see your ADT equipment.  If you opt to pay for the more expensive plans ADT offers, a professional will take care of everything for you, from installation all the way to 24/7 monitoring. That's as reliable as it gets.