Not so good
As a dedicated bike commuter, I need and use a lot of lights. This one seemed like a great deal (and it's a Planet Bike, which are usually well thought out products), but it turned out not to be so. It doesn't seal at all, it has holes in the casing, and any moisture at all causes it to either A) stay on permanently, B) run down the batteries, C) completely disable the switch. I got about one year out of it before the rains destroyed it.
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