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I get about a dozen shave with a blade (I am not doing anything special to protect it), the running cost for me is about 3 cents per shave for a DE vs 6 for the feather. (I am talking in GBP here...

I have a feather SS and use it along my straight. I like the balance and the extra length compares to a half de shavette. I found it more forgiving than other shavette.
Everything in it scream...