haven't tried it yet. i get my caffeine the old fashioned way: coffee and coca-cola. i've had the occasional red bull, but only when i need to stay awake and i am drowsy.
just so you know, these things do not replace your reflexes. i mean to say that if you are sleepy, it will only keep you awake. nothing replaces reflexes except sleep, so don't expect to drive any better if you are tired.
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