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Pros: Ease of Use, Overall Quality
Cons: None
Awesome bit of kit.
Got one of these a good while ago and had it on my keyring in my pocket for months without issue. Saw another review saying "It isn't secure and pressure builds up" that wasn't true in my experience. (FYI- For the paranoid... pretty easy to further secure with a piece of shock cord and a cord keeper through the cap and body loops.)