Hi,
I've been pretty much been using my first one a RR1021 "hard", (I hate that description). It's been to the stones several times, and the core feels much like my Mora S1 laminated blade while sharpening. That core is hard and pretty tough to boot. I used it last fall to dress several dozen geese, ducks, pheasants, and grouse. I have used it to blend a step out of a large radius in a bunch of 6/6 Nylon, deburred aluminum, and even a couple of pieces of 304SS. The stainless was a bit much for it, it did put a tiny chip in the edge, but my toolbox with my Shaviv was clear across the shop!

From what I understand, it's a Japanese made laminated blade assembled by Rough Rider into these lovely small lockbacks. According to the advertisement on the dealer website, it's supposed to be laminated plain high carbon steel. But I find it odd that with all the exposure to blood last fall, not to mention all the other chemically funky things it's been exposed to, it did not patina like I thought it would. It still looks the same as when I got it. The pattern still plainly visible on the blade. The bolsters have faded a bit from the pocket wear, but are still visible also.
If you are wondering how I can abuse this pretty knife as I have, the first one I ordered isn't quite as nice as the ones everybody seems to be getting. The blade tip is warped to one side so it almost touches the the liner on one side, and the back spring has a small gap on one side also. Perhaps not pleasing to the eye, but mechanically solid to use. I love carrying and using it.:thumbup::thumbup: The second one I bought, is as good as anyone else's. And sits in it's box unused awaiting the day my favorite suffers loss.
If you haven't used your RR San Mai yet, you are missing out on a treat I think. I honestly hope Rough Rider issued a few more patterns with these blades. Could you imagine a Congress or Peanut with these San Mai blades and Blacklip Pearl?

Dale