Serator,
I brought back a Speedlock with Thuya wood inserts from Den Haag, the Netherlands back in '96. I believe Boker was using 440C at the time. My examples edge holds up well under mild to moderate cutting tasks. A quick pass or two on a crock stick, or fine diamond hone is all that is needed for edge maintenance. I hope that the now common top locks are NOT 420J-2. That would be a real shame. I find the general ergonomics of the Speedlock very nice.
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"Blessed is the Lord my rock, who trains my hands for war, and my fingers for battle..." excerpted from Psalms 144.