I received one of these as a gift. Such a perfect gift for anyone who's outdoorsy or anyone who lives on a planet that gets dark. My original one has been in my pocket many times in house fires (firefighter), the rechargeable USB port slide, charging, and light all work like it's brand new. It's feather light, super bright, has a fantastic battery life, and charges easy.
There's no reason not to have this with you since it's so tiny and light. I love that if you lightly press the button it's easy to flash it on without it clicking, so letting go shuts it off. Makes it easy to do Morse code too, if I knew how. :)