Here’s a thought, while this is a great solution, it requires you to buy a new setup (which is pricey considering the cost of the basic SmartThings hub).
Some folks using RBoy Apps have been able to replicate this setup using their existing smartthings installation/setup.
The use of the Intruder Alert Management System:
This provides the basic security setup which monitors you motion sensors, tampers switches, door/window contact sensors and then sets off an Alarm, takes pictures, turns on Cameras/lights/swtiches, sends notifications etc. This is pretty much all in one setup for security.
Coupled with a Lock User Management or any other stand alone app for arming the security system:
Folks use this to arm the security system by when exiting the house using lock button on their locks (there’s an option for a delayed arming after locking).
Basically there exist options within the ST ecosystem to replicate the ADT setup and even surpass it using all types of interfaces, if you like a Dashboard, combine the Intruder Alert SmartApp with ActionTiles to arm your setup.
If you like Keypad, you can use SmartApps for that, if you like Locks, you can use the User Management SmartApp, if you like the system to automatically arm/disarm based on when you leave/arrive, use routines with the Intruder Alert SmartApp.
I think SmartThings as a platform with the right SmartApps provides users many more options for a lot less than a dedicated ADT interface. Having said that if you’re more “comfortable” with your ADT setup and don’t mind the premium pricing for the brand (and the possibly fewer customization options) it’s a great option.