I dunno, the houses with them on are getting bigger and bigger, and some of the amazon reviews talk of big installs.
The PIN etc, yeah, not likley. The jamming though, really easy, reliable and cheap. I'd love to say much more expensive alarms can't be jammed, but a fair few can.
So far in the last 4 years, I've had 8 people approach me about break-ins without alarms going off. One of them I would definitely put down to mental health issues, one was a wired alarm, but the other 6 look credible. Hard to say really.
Just think manufacturers should all be pulling their weight here, and now stuff is getting Internet connected, even more so. Videofied was terrible, as was Risco.