Incidental to this thread I shaved a 30-hour beard yesterday - shaved half my face with a GIllette Slim Adjustable and the other with a (new-ish) 2014 Muhle R41. The vintage Slim was set at #7 and both razors had new Personna Blue blades; I prepped with warm water and Noxema cream, lathered with Stirling soap - three passes and warm- then cold water rinses.
Conclusion? From first pass to last I couldn't tell a difference - the results seemed identical.
The Slim (in the photo below) is opened up to #9 and seen next to the R41 where blade exposure seems similar. If anything this test left me more impressed than ever with the 55-year old Gillette's quality and versatility. I think the Muhle R41 would be harder to clog than the old Gillette but I shave often enough that a clogged razor isn't a concern. Besides, I never clogged a straight razor so there's always that if I ever seriously beard-up and then decide it has to go. :D
With either the Muhle or the Slim I can easily get by with a single (ATG) or double pass at 24-hours - about the same as a straight. Neither of the safety razors provoked redness or irritation nor would I reccomend the R41 or the Slim (set above #5) for rookies.
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