Steve: ( 53driver ) is right on with his observations. In the early 70’s I put a product called The Firefly on my XS650 Yamaha and noticed the cagers noticing right away. The cagers would slam on their brakes instead of finishing their left hand turn in front of me. Now much older and probably no wiser I still install a headlight modulator. But as Steve pointed there is time and place for their use. Country roads where the locals don’t see many motorcycles is a great example because they come down their long gravel driveways and are not use to having to stop
but when they see the flashing freight train coming they hit the brakes and watch with open mouths as the mighty F6B comes rolling by. They are worth it but be considerate of others when in traffic.