never had my old one touched or stolen, the standard vw system (alarm/immobiliser) is thatcham cat 1 rated, so to be honest theres no point upgrading it to an aftermarket (unless you want remote starting/paging systems etc)as your gonna be splashing out and i doubt it would reduce insurance costs etc, just make sure the car is insured in case it ever does go missing, there are scum bags every where that will put your window through for 50p youve left on your dash so nothing is safe...