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I have one of these. I'm not sure about how the toughness stacks up, but this steel takes a screaming sharp edge. It's impressive and a real pleasure to use for standard EDC tasks. It zips right through paper like its nothing. I also read that this steel is used in razor blades, and I would not be surprised at all. The edge is that sharp.
The colors here are really not my thing, but the knife itself is a good one.
The "problem" with that (if it can be called a problem at all) is that it's not so good at holding that screaming-sharp edge for long, especially when used to cut hard materials. But with that said, that composition also means that you can bring that screaming-sharp edge back very easily, even with a Spyderco Sharpmaker!
I have one of these with the combo edge and it's a good EDCer. And don't underestimate tanto blades; they can be quite useful! : )
Edit: Dammit, why does the comments system truncate URLs?! I tried to link to ZKnives' steel composition graph, but it didn't work. Just google "CTS BDZ1 Zknives" to get to the graph directly.