120 mph for miles on end and no problems at all. If you like put extra or longer brackets on for none, only the bottom flexes back a little at very high speed the folded outer edges strengthen it where it matters.
And re weight and ease of fitting etc.
No, not heavy, and you do not even have to touch the wiring, the indicator cables extend that far when tugged gently and go back when I put them back on stock fixing point with no mod required at all when I swap out for Flyscreen in Summer. They come off in one piece with the screen/s all with just the 4 Fork Fixing Kit bolts and the 2 nuts holding the indicator stalks which stay firm even at 120mph. Just lean the whole screen/s combo in a corner until next winter re-install.