Bought them, like them. Lighter and cheaper than my Krill lamp, I don't think they are as robust or water tight as the Krill or GloToob. That being said, I've got two in my truck, one in my EDC and a few scattered about in my gear as they are about a one-to-one volume and mass replacement for a chemlight (which I still carry in the vehicle and in my evac gear) for a lot more light. If I really need to keep one water proof, zip locks, packing tape, or a condom all work for a while.
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-IronRaven
When a man dare not speak without malice for fear of giving insult, that is when truth starts to die. Truth is the truest freedom.