Pros: Brightness, Battery Life, None
Great but don't put through the wash!
I love these lights and I have several. Their small size means you can always have one in a pocket, on a key chain or clipped to a jacket, and it's there when you really need it. The range of colors is neat and they're pretty durable. Just don't forget to remove from your pocket before you put your pants through the wash. My turquoise Micro Light was never quite the same afterwards.