Lemme see, hmmmmmmmmmm...I'll be 60 in March, have been driving MG's since late teens.....hmmmm, about 40 or so years...you know, I've never seen an MG flip over or heard of one (& don't go telling me about the Olympic athlete who flipped his back in the 70's - he was drunk, ran off the road in a curve & hit a stone wall that caused his car to flip)...."style" bars (I suppose that's the politically correct way to say 'sissy' bars) are probably more dangerous that no bars in a flip sequence as they'll flatten out and crush your head or neck on the way to the ground
I'm not against installing them for looks (heck, we're building a double hoop system for the V8 car - for looks), but, IMHO, don't install them thinking you're going to get even a tiny bit of protection...if you want protection - wear a helmet!
Don't mean to tee anybody off or anything, just my 2-cents worth!