I've got a several hundred of these counterfeits. If anyone would like to try them, I'm happy send as many as you'd like. They're not horrible, but they're well below the standard of real Polsilver SIs. PM me if you're interested - otherwise I'll bin them next week.
I keep my bad blades for spray paint fume or cutting clothes labels. I use maybe 10-15 per year? At least they serve a perpose.