I'm a big fan of modulating headlights. I KNOW that they make me much more visible to car and truck drivers, even if the flashing lights probably annoy some drivers. Sometimes drivers seem to think that I am an emergency vehicle, and they pull over to let me pass, which is fine with me. Sometimes oncoming vehicles flash their high beams at me repeatedly, which I don't know if they are trying to signal me that something is wrong with my lights or that they are annoyed, but its not a big deal to me. I've had this feature installed on every bike that I have owned since about 2005 and I virtually never have a vehicle turning left in front of me where I feel that I was in danger. This feature is, in my opinion, such a positive safety addition that I am amazed how rarely I see other bikers with modulating head lights. Why would riders NOT want this inexpensive modification that might save their life?