Best friend worked for ADT for decades. I have a great system. Stickers in the windows, and the sign in front. Very reliable, never need batteries or service. 

ADT Alarm Ripped of a Friend
While friend was replacing a low battery, securing tabs of the battery cover were broken off.
Needed a replacement plastic cover to keep window alarm unit functioning.
ADT RIPOFF SPECIAL
SERVICE CALL - REPLACE THE ENTIRE WINDOW UNIT AND BATTERY
$150 SEEMS EXCESSIVE - EXTORTION
BATTERY DIED WITHIN THE WEEK!
COULD HAVE MAILED A $2 PART!
Customer was SERVICED
RE:Humor 12/6
http://smith-wessonforum.com/lounge/712929-humor-12-6-a.html?highlight=HUMOR
Humor Number 1 for that day
Bekeart
My system was installed and maintained by me. When it needs service, which is rare, I give myself a substantial discount.
My back up system requires much more maintenance but is more effective because it is proactive:
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When I put my last system in I did a lot of R&D. The system I chose has been completely awesome.
I didn't know it when I bought it, but after it was received I learned that the parent company was based in Israel. All components are Israel manufactured.
I have dozens of sensors, and if any one of the batteries gets low, the system tells me. All of the batteries are USA standard so I never have to worry about replacing one.
Just so I would be safe in the future, I bought spare sensors for the key locations. It has been 36 years now and none have failed, but at least I'm ready.
Which system did you go with GypsmJim? I am shopping around for a replacement system and would appreciate your insight.
My system is manufactured by Visonic. Their retailer way back when was "Smarthome". My specific model was "Securelinc". It was a basic "kit" with dozens of optional add-ons, many of which I purchased.
I don't know if the 2 companies still work together or not. Plus, I'm sure that after all these years the product choices have changed.