I tried these for no other reason than nostalgia. They weren't stainless, they were carbon-steel. I bought 100 and tried them in an open comb Parker, an expensive razorock Wunderbar Slant and a Feather AS-D2. It did as well as any other blade in the first 2 razors in my hands... NICK FREE BBS, but the Feather still likes Kai & Feather blades best.
I usually get 5 or 6 shaves from a blade. I quit after 3 with the Treet blades. Still, they are cheap enough to even use just once if you buy them in bulk. The price drops from $0.25 per blade for 1 pack to $0.09 per blade when you buy in them in the hundreds.
I'm rubbing my face now at 2220 hours, 13 hours after a Saturday morning shave and there is still almost no stubble. Not too shabby for a discount blade. I DO, remove the blade gently blot it and the razor dry and everything carefully dry air dry prior to putting MT razor back together to proactively prevent rust