I've been professionally installing alarms for over a decade now. I started off with DEI products; Viper, python, avital, clifford, etc. They are great and sound alarm systems. This is my personal take on the two systems. DEI is snap on, and Autopage is Craftsman (old made in america craftsman) The autopage is 99% as good in quality, features, value, etc. The only difference comes in price. And autopage is the better value, hands down. The last 4 alarm systems that I have purchased for my personal use have been Autopage. This model in particular is your above average system. It has great features, a great price, but only moderate range. It is perfect for the price. You can not beat this deal.