In all fairness in todays world you can buy the best the greatest alarm or deterrent in the universe and the bottom line is IF SOMEBODY WANTS IT BAD ENOUGH, IT'S GONE!!!
That Ravelco thing that was talked about above, the wife has that on her Audi. So did her friend with a BMW and they had no problem loading the BMW on a tilt bed tow truck and taking it someplace more convenient to work on it. It wont let them start it but the damage to get in is already done, they punched out the steering wheel lock with a hammer and punch and pulled it up on the tow truck with a winch. This was done while she was in getting coffee and a doughnut, crooks have become as efficient as a pit crew at a NASCAR race. So this is the reason for the Smart A comment on my part, but if you SHOULD find the perfect product to prevent this problem let us all know please!!