I've carried a AAA-P on my keychain for almost two years now. Except for one scratch that somehow happened when I dropped it the first week I had it, it barely shows any wear.

I picked it over something like the brighter Fenix AAA lights for the battery life, but with my typical usage of the Arc light, I'm not even using a battery a year. So I'm considering a Fenix instead. (I have a AA Cree Fenix but it's a little big for keychain carry).