This was my first use of the Feather ProGuard Blade. This evening's shave was the 11th for this blade. After the shave I cleaned the blade with a soft toothbrush, dried it, and then took a very close look at the edge with my 12X Jeweller's Loupe. I did the same after five shaves with the same blade. Also, the blade was removed and cleaned after every shave. I am starting to see a few spots where the edge looks like a hack saw so the blade edge is starting to wear. I got a nice four pass bbs shave this evening and I'm pretty sure I could get a few more good shaves from this blade but I'm anxious to try a Feather Professional so I'm going to bin this Proguard after 11 bbs (4pass) shaves. I should mention that the blade was used each time in a RazoRock Hawk V2 SE Razor. I've used a lot of DE blades in a lot of DE Razors and I must say that these Feather Artist Club Blades are amazing. I don't like to use a DE blade more then 4 times and that goes for all the DE blades I have tried. Going ATG under the nose is where I really noticed the blade performance and the Artist Club ProGuard just stayed sharp for all 11 shaves. I could never achieve these results with any DE blade. I'm really impressed.