Security concerns: Wifi/APP/Registration to external service

1. see question 2.
2. No idea, Kerui, Securi some other parent company in China, maybe they subcontract it out??
3. I am pretty sure china.
4. If you have IP camera's they could access those, but as far as the alarm not much really.. unless they were also part of an international house robbing syndicate with robbers in every city then I suppose they could turn off your alarm from their HQ before they broke into your house.
5. Yes but only on your local Wifi, the 3G needs their servers.

I think unless you pay a squillion dollars for a casino type alarm system, it doesn't matter which alarm company you go with they will all be outsourcing and cutting corners.. trust no one