mate of mine with a an SV5000 VN had 3 attempts on his car back in the mid 90's, they never got in, he deadlocks his car, once they broke the rear quarter, thats it, couldnt unlock it and left, second, pried out the left hand lock handle, couldnt get in and left, third, pried the drivers side, couldnt get in and left.
I have to laugh and say "sucked in" to all the commodore owners who have deadlock but never use them and have had their cars stolen and/or broken into. i have to say, i told you so.
Like another mate of mine earlier this year, had his limited edition V8 around 2001 statesman stolen, never had it deadlocked outside his house on the road.