I don't think the Wonderedge IS cryo-tempered...
Late getting into this one,
but unless I've misread something somewhere, the DD Wonderedge was not advertised as being cryogenically treated at all (I have a few but am considering selling one or two...I HATE being broke) but rather they laud the electrical tempering process, where there is greater control over the temperature than in other methods which usually involve some form of insulation (as I understand, the steel is heated, then quenched, after which it is quite brittle...then the tempering process takes place, where it is again heated, then forced to cool much more slowly, giving the steel its toughness. I don't recall ever reading any material claiming the Wonderedges were cryogenically tempered, unless perhaps the stainless ducks were (?) Not saying the others were not, but I do not recall actually seeing it being claimed anywhere that the WE's were cryo-tempered. Perhaps I'm wrong, but just don't recall seeing it anywhere.
Cryogenic tempering was, however, a process used on many higher quality stainless razors, the Henckels "Friodur" (ALWAYS a stainless, or INOX razor) Hess "frozen temper" or even the Dovo "ice temper" stainless blades.
Perhaps someone can shed some light on this, or perhaps has something with better info than I do....until then, I think the Wonderedge's largest advantage is the manufacturer's ability to keep the steel at a certain temperature much longer and cool much slower as a result of the electric oven process they used (as opposed to placing the steel in an insulating media which retards cooling, but is nowhere near as controlled as an electric temper, nor does it keep the steel at certain temperatures as long....
I think that's it anyway.
:shrug:
John P.