I just switched after 20+ years with ADT to Simplisafe Gen 3. Great product, fantastic out of box experience and a simple, painless, un-intrusive web-based buying experience.
To quote IPVM's Ari Erenthal:
The alarm industry breeds contempt with mandatory contracts and dealer code lockouts. Millennials, with their low home ownership rates and DIY attitudes, are already inclined to be mistrustful of the alarm industry's patronizing attitudes and insistence on multi year contracts.
RMR? You are as locked in with Simplisafe, practically speaking, after paying them $500+ for the technology, as with any traditional alarm service, but without a gun to the head.
Compare web sites and you see the the future and the past in contrast: buying a Simplisafe system is a quick, comfortable, friction-free experience. With ADT the goal is initiating a sales call. It's not only Millennials that allergic to the hard sell.
Listing by a Nationally Recognized Testing Laboratory (NRTL) such as Underwriters Laboratories, Inc. is not for marketing, it is to help ensure reliability. NFPA 70 of the National Electrical Code (NEC) requires that all products be listed for their intended purpose. It is important to remember that this product is sold to consumers for security and life safety purposes so listing of same is mission critical. The same holds true for smoke and CO detectors. In other words, I do not think anyone would ever knowingly buy any life safety smoke or CO detector if it was not listed by UL or another NRTL.
Reliability is mission critical to any security and life safety system and to sell any product in the stream of commerce that is not listed is dangerous.
Consumers and authorities having jurisdiction (AHJ) need to know.
No electronic security system and life safety system should be sold and installed to the public that is not listed as defined by the NEC.
Jeffrey D. Zwirn, CPP CFPS, CFE, SETFASI&T, MBAT, CHPA-IVPresident, IDS Research and Development, Inc.
 Certified Protection Professional, Board Certified In Security Management, American Society for Industrial
 Certified Fire Protection Specialist – National Fire Protection Association International (NFPA)
 Certified Fraud Examiner-National Association of Certified Fraud Examiners
 NICET Level IV Certified, Senior Engineering Technician, Fire Protection Engineering Technology/Fire Alarm Systems-National Institute For Certification in Engineering Technologies (NICET)
 NICET Level I and II Certified Engineering Technician, Fire Protection Engineering Technology/Inspection and Testing of Fire Alarm Systems-National Institute For Certification In Engineering Technologies (NICET).