All very interesting, and all very Marmite.
I had mine removed when I bought the car as I thought they looked rather naff and retired.
Oddly, after putting them back on so that DaveW could have an image of them for his forthcoming publication, I have left them on!
I am not sure if they make all that much difference, but having them on means that I feel OK about leaving the sidescreens off.
All very interesting, and all very Marmite!