I had the Librands roll bar fitted to a previous Morgan, 2004 4/4, so not as tall as a traditional roll bar however it did stiffen the chassis and made a noticeable difference to the handling so wasn’t just a cosmetic change, won’t say improvement as we all have our own views on what our cars should look like.
I also had a 4 point harness fitted which made a surprising difference to my ability, limited as it is, to drive quickly as I was held in place so firmly. Unless you have tried one you don’t realise how much you get thrown about on a bumpy road. Only drawback, other than the extra time to fasten up, was that it was impossible to reach the handbrake!
So I have to say in my experience a roll bar does make a difference.
