I have one on my keychain, too. It dates back seven years. But, best EDC ever? Maybe once, but time has moved on and the Arc AAA hasn't. As small and tough as it is, when the Fenix E0 came it it was obvious the competition had caught up. And we've come miles since then. The newer lights are more efficient, brighter, the beams are nicer, and they don't require you to crush batteries and keep threads clean. I can't see a logical way to dispute this.
I still like my Arcs (AAA, AA, LS), but sadly they are now history. Maybe a new design will emerge. I hope so, and I'll jump on it if it once again sets the standard.
Geoff