It Works !!!
Just had it installed today - Three soft beeps when it arms and one soft beep when it disarms.
It is not a "chirp" (much classier). A very soft tone that sounds digital. It's not the same sound that would come from the siren when it's activated. Just enough to let you know it armed from no more than 10 feet away.
I highly recommend this mod if you're tired of looking behind you every time you lock your car.