There has been a lot of talk online, on various forums about using some of these cheap lights as a companion for someones concealed carry pistol, or even as a weapon mounted light. I’ve owned many of these lights from places like DealExtreme.com and other places, and while these lights are fantastic for having around the house, you must keep in mind that they are rather fragile, especially when they get hot.
Something to keep in your glove box, shove in your wife’s purse, etc, great, these cheap lights will probably serve you well, but something that you will train with, and possibly use to help defend your life, I’d pony up a little more scratch and get a name brand light from a reputable manufacturer.