Planet Bike sells a rack mount for their blinkies for $5 and it works great. I picked up some new Superflash Turbos and they are bright. I was out for a ride with my wife on a bright, sunny day and had a guy sprint to catch up with us to find out what lights we were running. He said he'd seen them from way back and was impressed. I did have a problem with them shutting off randomly but discovered it was loose batteries. Bent the battery contacts out a bit and that solved the problem.