Blackjax can be got round but the jacker would need to know it was fitted before driving off and he isnt going to know or worry about it in the heat of the moment is he?

I have it on mine and its reassuring to know its there but at the end of the day if someone pulls a weapon they can have my car - I'm not getting stabbed for any old lump of metal! You hear of too many heros getting killed trying to protect their cars

I always leave a gap in front of me at traffic lights etc if in a dodgy area or late at night etc, my alarm also locks the doors when I start driving.