I have a yellow one on the underside of Reflecto-Bike's top tube. That keeps tire spray off it. It's pretty stealthy when turned off, so I don't worry too much about it getting stolen when parking at the grocery store. For the price, I'm fairly satisified. I also have a Fibre Flare, which is more omnidirectional and twice the price, but for the role of side visibility at under 50 meters, I think they're both good.