I keep getting these as presents. And good thing too. I have a tendency to loose or break them. They are great for doing night time chores, as others have mentioned. They are also wonderful to leave as a beacon to help you find your way back to your campsite at a large campground, or when you find yourself waaaay at the back in a twisty turny campground that you've never seen in daylight.
I did have one stop working on me though. It got stuck on, and wouldn't turn off.