I’m hoping my Ulster never does this!
Youtube Do you remember that footballer who comprehensively rolled a lightweight Roadster a few years ago in a celebrity Morgan race? He got away with a grazed helmet top but if he’d not worn a helmet.........😳
Both these examples are from race tracks, and are an excellent illustration of why roll bars are a very good idea - in a competition environment.
For road use, I remain sceptical. But then I don't even have head restraints on my car, so it's clear that my attitude to risk is considerably different to many.