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I've found the Silver Blues and Astra's to be pretty comparable in both sharpness and smoothness, with the exception of the first shave on an Astra blade, which seems a tad rough. But at about half...

I'm glad to hear that you liked it. I've used Astra SP and Polsilver blades in mine so far and both have been great. I haven't tried a Feather at all since The Great Face Mangle of 2015, but might...