I've always worried about those electric winders.
When I got my Stratocaster they gave me one of these, but I don't even use it.

When using my simple little handcrank winder I've noticed that the cup is so big that it doesn't stay centered and if I'm not careful I can bang it into the other knobs and have even come close to actually nicking the headstock. And that's only at handcrank speed.
This makes me worried that an electric one might have the torque and speed to actually F up my guitar.
Does anyone make an electric one with a somewhat soft rigid rubber cup with more of a conical recess instead of the rectangular hole type? It's hard to explain what I'm talking about, but I drew a terrible picture:
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