I'm going to offer this: the Streamlight KeyMate is a great little light for the money and size. It is so small and bright that I carry one on my keychain all the time. It's actually smaller than my keys. Furthermore, it can run up to 96 hours. I don't think the Arc AAA can do that. (Of course the light gets dimmer with time, but after waiting to be rescued for 2 days, the KeyMate will still be giving some light, whereas my fancier lights will be long gone.)
I gave a KeyMate to my wife to replace her MiniMag. And catch this, my friends at work liked it so much that I have had to buy and sell 15 of them so far.
Now, having said all that, I have to say that I also carry one of the following in addition to the KeyMate: Arc AAA, Arc LSH-P, SureFire E1e KH1, CMG Ultra, and soon a McLux. So, my response is that, yes the Arc AAA is better than the KeyMate, but then so are any one of these.
Someday, I might forget to pickup one of the bigger lights (or maybe I just won't want the bulk that day), but I will always have my keys and my KeyMate with me.
And the price? You can buy 5 KeyMates for $38 from
BrightGuy.com. You can buy a single one for less than $10.00.
That's just how I see it. Your mileage may vary.
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Chuck