I had one of those. I got it from "deal extreme" I think, it was about $10. I gave it away. I's nothing special. It's hard to see the lines on the road. I've owned three or four that have laser lanes, one even had a bike logo in the middle of the lane. They were good taillights, but that's about it. I ride home once a week behind a guy who uses one. I can see it in the dark when I am on my bike behind him in the dark. It's hard to see in car headlights.