Has anybody got this? If so how does it work and is it worth the money.

I have it, Im not going to tell you how it works as that kinda of defeats the object, but it is simple to use and is VERY effective. and helps secure the car against key theft from the house, and also by force from traffic lights ect.

Well is it worth the money?

Well worth it, especially since the mojority of car thiefs dont hot wire cars anymore, they just mug you, or break into your home and steel your keys. With Blackjax on they wont get out your street.

Easily worth more money.