After trying a Feather blade for the first time last night and doing a second shave tonight, just finished minutes ago, I will give my evaluation: Do NOT shave with this in a heavy razor! It is for milder razors like the Weishi 9306. The Feather is ridiculously sharp, certainly lives up to its reputation, and gives practically no irritation. Having said that, even though I used no more pressure than I normally do with my Merkur 34c, I ended up with a bunch of weepers. They were quickly closed up with a little pressure to stop the bleeding, but daaaamn, that blade nicked me up badly! I suspect that this blade was designed for lighter-weight razors. Don't get me wrong. If you prefer sharp blades over smooth ones, can learn to master shaving with it to reduce nicking, or have a lighter-weight razor to put it in, this blade is definitely a keeper and as I have heard it, it lasts a good long time. I'll probably keep a tuck or two handy for when I'm on the road and have my Weishi with me. But understand going in that this blade really does require a lighter touch. I think I'll stick with my Astra SPs and PolSilver/Wizamet Super Iridium blades, and give the Kai blades a try to see if they'll provide fewer weepers.