defo worth having, been very useful in my motors and my kids motors in proving that third party fully at fault, if the other way round just swallow the memory card ;)
good old days were the best anti theft devices, well hidden switch to cut power to coil or even just taking rotor arm out of dizzy if car not used for a while which worked a treat many means ago when scum trying to pinch my defender, I'm sure if you used some sort of hidden switch to cut feed on...