Natural, like all YMMVs. I've been using these Derby Double Edge Razor Blades 30 Ct in my 1960 Gillette Adjustable 4/5 Set for several weeks and have found them to be great blades. The 5/6 setting tended to be a bit harsh and the 3/4 setting too light. I can get three good shaves, one normal shave and one lousy shave with one blade (I suggest switching blades before shaving, OK). When I switch to my EJ8911, these blades don't work either. Even with 4 passes I couldn't get a close shave. So far the EJ8911 seems to have preferred more "high performance" blades like the Feather. Overall I would say these are good blades and you should try them for yourself. I will order some of these again.
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