That's exactly my experience with other razors, but reaching the same conclusions that you have.Good afternoon gentlemen,
This is to share our experiences with what are considered to be the two sharpest blades out there, namely Feather Hi Stainless and Bic Chrome Platinum.
I've used both blades, mostly in mild razors (Gillette Tech, KGC, Slim Adj. on milder settings <6).
These are my findings:
On the first shave, Feathers are amazingly sharp. No other blade has given me this "wow" effect. I believe their reputation is largely due to this very high sharpness during the first shave. Put a fresh blade in a relatively mild razor and you can hardly feel you are shaving. Just amazing.
In comparison, the first shave with a Bic CP is good, but not exceptional. The blade feels sharp and reasonably smooth, not unlike any other good quality blade.
On the second shave, however, the things change. Feathers still feel quite sharp and crisp, but the "wow" effect isn't quite there anymore. I get a nice clean shave, with what feels as a good sharp blade. It is similar to what I get with the Bic on the first shave. In comparison, the Bic CP on the second shave is almost scary sharp, definitely sharper than Feather at this point. Not the smoothest perhaps, but in a mild razor, it is a pleasure to use.
On the third shave, Feathers start to feel a bit dull to me. Still no tugging, but the initial sharpness is long gone by now. Bic CP, in contrast, is still very sharp and reasonably smooth. No problem.
On the fourth shave. Well I only tried Feather once for a fourth shave. Not a good experience. The blade is plain dull, like Derby or SuperMax dull. To me Fathers are good for maximum of three shaves, that's it. With the Bics I could get a pretty OK fourth shave. The blade still feels sharp, but somewhat rougher than before. If I only go for two-pass (WTG XTG) shave there is absolutely no problem. An ATG pass may give me some mild irritation.
So, these are my thoughts. Given the price difference between these blades, I see no point of buying Feathers anymore. At 4-5 times the price, they give me two perfect shaves (three with some compromises), while Bic CPs give me at least three perfect ones.