I am going to get one due to the amount of idiots, scammers, cash for crash frauds and generally dangerous twats out there.
Took wifey out for a pub meal on Wednesday and coming back nearly had a head on with a complete prick in a white transit type van who was carrying out an almost suicidal overtake, I had to brake almost to a stop and get the car right over to the left almost up the verge to avoid the wanker. I think a dash cam is the way to go to at least cover myself in the event of an accident.