Charlie Moore said:I have one of these myself. It works reliabably but it is not as bright as say a Photon, Peak or Arc keychain light -- especially the newer models with more efficient LEDs. I can't speak to the FireFli's runtime as I've not used mine enough to tell.
The big issue is how long the battery lasts when not in use. If you have had it for a year or two and it still works, their air vent works.