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They can be handy, a lifesaver, and a downright must-have around the shop, home, or office, but with electric screwdrivers/drill drivers popping up around every corner, how do you know which one is ...

I've been thinking about buying one of these but I don't know if they are just a gimmick. Also, if they genuinely work well how good do your bits need to be in the first place to be worth sharpening?