I'm using all Bic now on all my razors except Feathers on my Lupo DE. I've found Bic to be the blade that pretty much works on every razor. Second shave and on, it's sharper than a first shave with a Feather. And smoother too!I've read here often that the second shave on many brands of blades is better than the first. One theory is that the first shave wears the "rough" coating from the much sharper, naked blade edge.
For me the Feather is trash after the second shave but the Bic keeps going.
Great blades for sure and a lot cheaper than Feather.