Experience with House alarm systems

[Shroomster]

ok here is the short of it...

Have a system monitored through ADT security...they've been awesome on response to alarm signals and such (false alarms but still)

I want to get glass break sensors (not on window, the kind that hear/sense the glass breaking)

ADT said the board we have is not compatible and we need to upgrade

Think they might be yanking me to upgrade I dunno

but anyone have any input on glass break sensors or anything of the like?

we want to get them so the cat can roam around and not be cooped up in a bathroom all day out of site from the motion sensors

please don't comment on the service of ADT; it will vary city to city