I have had one in the last two houses, mainly for peace of mind more than anything else. My homeowners insurance also gives me a 20% discount for having it. It covers all entry points with glass break and motion as well. It has a primary communication thru the telephone wires but if they are disabled it also has a celluar modem/phone thingy in the attic which sends the signal, it is silent so the burglar is unaware it is tripped, it also has a speaker/mic thingy in the hall way where the monitor service can listen/speak with us (a light on the panels lights up when it is active) and lastly it has fire monitoring which I know works since the toaster set it off. lol
Todd
