Okay, first off, what exactly does this thing do? I've heard tons of people raving about them, and I figure I might try one out.
Secondly, which model should I get? There are a bunch of different ones on ebay, and I have no idea which is which. Help.
Secondly, which model should I get? There are a bunch of different ones on ebay, and I have no idea which is which. Help.
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