We've looked at them and will probably be doing an article on them later this year. However, given the long life and reliability and 10-year shelf life <!> of small pocket-sized and key chain-sized lithium battery powered LED flashlights and compact LED lithium battery powered headlamps, I personally believe them to be a solution looking for a problem. While the latest generation are more practical than their original predecessors, I still don't see them as truely practical given the more easily used, carried and often less expensive alternatives. Perhaps I'll change my mind after testing, but...