i got some gsb in the mail today and switched out the old feather that was at the end of its life in my rockwell and thought ill give em a go.well what a shave! they are for my face damn close to the feather for sharpness but a scale of multitudes smoother at the same time. the fun part though is that on the same setting of 5 because they seem stiffer than the feathers it seemed the aggressiveness was greater as well. is this actually a thing the stiffness of a given blade changing the aggression of a razor? or was i just imagining it? either way although more aggressive a shave than normal it is also a better shave and smoother than ive been getting from the feathers with less irritation as well. tomorrow i will go back to the 4 plate and see how it goes there.