I have had security monitoring with this company on my house for the past 3 years. You pay for the entire year upfront on your annual due date. Mine was every August. We were moving out of our home in November 2009 when ACA called in September to remind me that I had not paid for our yearly service in August, therefore I was not being monitored. The credit card they had on file was expired therefore they could not automatically bill me. I told them I didn't need their services anymore because we were moving in a couple months or so. They... read full review »