I had an A3, but gave it to my sister, and she promptly lost it.
I have an A23 on my keychain.
I prefer metal bodies because they are more durable than plastic.
I have two different Nitecore keychain flashlights, and they both fell apart because they had parts made of plastic.
I also have a Trustifire MiniX, and guess which part broke? Spoiler alert: It was the plastic part.
My favorite keychain flashlight is this one, which is a RovyVon clone that’s actually better and cheaper than RovyVon:
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