Mine just arrived and I need to find a warm garage to install it. They are neato. They confirm the actions with the main unit and alert you when it completes an action or if the alarm is tripped.
Most use a car icon so I got one that uses text messages. Here's a sample of the alerts it provides:
Armed
Disarmed
Car is Starting (car...eww)
Car is running
alarm triggered zone 1, 2, etc
Your battery was stolen
You are about to become stuck
You have been booted
A window was broken
HA HA you are stuck
You have a flat tire
You put the remote battery in backwards
You are not going to wear THAT are you?
Your car was towed away
Just Kidding
Don't press that button again
The time is now X:IV
Klingons detected
and many more.