I bought some of these in a sampler pack to try out with my new r89, and found them disappointing - they tugged a fair bit and felt very scratchy, I suspect I will not be using them again.I bought these out of curiosity to use in my single edge Dark Stag folding Kamisori. First shave was a total blood bath! They tugged a lot and skipped over my bristles rather than slicing through. Lots of skin irritation and nicks galore. I'll give them another go in the cut throat and then in my R89 just to be fair. I'll post an update when I get around to it.
Now Astra SS on the other hand...