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I started shavette shaving with Derby green Professional blades - in an Equinox. Now I use broken Feather blades in a Sanguine wooden handled shavette.
The Feather's do not break cleanly and so must be flattened at the break with pliers. Simply put - a Feather half blade can do 3 shaves on my old face IF proper softening is done. If the hair isn't softened perfectly then that blade is cooked in the first shave and you may have to replace it. That's just the way things are with such an acute edge angle.
These blades seem to be exactly what they say - like greens -just better steel. If you do just a use of some Proraso then shave - you should get 3+ shaves from a blade so $10 is a good deal for a year's shaving!
I remember when I started shaving with a shavette - and was all "Well I can shave with a really sharp straight razor!". When you move from a heavy razor to a light one you will get cut. So you must start with more obtuse edge blades like Derby!
They arent horrible, they can get the job done, but mine have been getting dull a little to quick, like I wont even do half my beard before it's struggling to much to cut my hair, but it's still sharp enough to cut my skin, so it can get messy, so I go through 1-3 per a full shave...