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A steep learning curve, depending on which blade you're using.

For a description of my learning curve with a 3-piece Gillette and a Feather blade, see here:
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When I rush a DE shave, I get (at the worst) razor burn and 'weepers', that a styptic pencil will handle.

IMHO, rushing a straight-razor shave is _dumb_. The cost of error -- due to rushing,...