I found this unit easy to install and subsequently found it very easy to add extra sensors and key fobs. It definitely detects people OK and I've had no false alarms. I'm very pleased with it. The new Android app looks nicer than the old one but it is a downgrade with respect to features: no notification sound and no indicator 'light' to tell you that a door/window is open. I find that a little annoying but on the plus side I've never noticed any loss of service - it has always found my alarm. I wish it had RFID key fobs rather that the seemingly fragile (and relatively large) battery-powered things. Note that (of course) app control and app notifications will be disabled if there's a power outage that takes out the internet connection. A land-line back-up would make it more resistant to this type of attack. I gave 'security' 4 stars for this reason.

Animal PIR's are pretty useless (i bought them as extra) although i haven't altered the sensitivity setting yet. But the main smart home kit is good and easy to use. Could use an external siren though.