Fortunately, I'm aware of how these salesmen work and the marketing tactics. I've priced out doing it myself and using Alarm Relay for monitoring in the past. I could go out and buy $800 to $1000 worth of stuff myself, which is what it really costs, as opposed to their artificially inflated $2,000 list price. Then install it all myself. Then pay for my own cell monitoring. When all is said and done, the math says I might save a few hundred dollars over 4-5 years. That extra $$ is time I didn't need to spend on it, and it's very nice polished web and mobile user interface. That is worth something IMO. Normally I love tinkering and doing this stuff myself. But right now, I don't have the time.
Of course, they only give you three days to cancel. But I told them if you don't want to give me time to research and ask your references, I'm still going to do it. And if I find out everyone hates it and your references bust, you'll be coming back to remove it in two days.