San Mai is really a rip off steel. It's got a good, mid-grade steel on the inside and is flanked by two unnecessary slabs of inexpensive 420 steels to protect the inside steel.
Now if the inside steel was hard and brittle, yes, the two slabs would help protect it from breaking. But Cold Steel makes entire knife blades from VG-1 steel, and these blades are often shown in their videos being clamped into vices and bent to various degrees without breaking. Since this steel is being used in knives up to six inches in length and performs well, one can't help but wonder why it would need 420 slabs protecting it!
I don't know, maybe CS makes their VG-1 cores hard and brittle, but I would be surprised if they were any different than the steel used in their Voyagers.
One of the best steels the company produced was the Carbon V, which was made by another company. When that company went under, the Carbon V stopped being available. AUS8 is very good as a stainless blade, especially when done by CS. I've found that whatever steel is offered by the company is about as good as it's capable of being. I have knives made from 440A (which I ordinarily don't care for), and most of them won't sharpen worth beans and if they do get sharp, they don't stay that way. But Cold Steel's knives made with that steel are exceptional. Not only do they get blisteringly sharp -- they actually hold their edges. People who own the old Pro-Lites and Night Forces seem to be very happy with them. I routinely carry a Recon 1 with a 440A blade and I love it. It's one of the few knives I have to warn people about when I hand it to them because it's so sharp.
Bottom Line: San Mai is beautiful when polished. Maybe CS does make the inner core brittle and sharp, who knows? For self defense, though, the steel doesn't really matter as long as the knife is sharp when you need it. I personally carry their 5-inch AUS-8 blade (in addition to the Recon 1), and it's done everything I need it to do.
The Konjo is a knife I bought just for its beauty (and the fact that it was
on sale). The mirror finish, razor sharp blade and quality sheath made it
a bargain.