Originally Posted by Gumby 
Even in the case of HSS or CoHSS where there are benefits to cryo treatment in these materials : When the tool is worn out, it is worn out. It doesn't matter than the treatment affected the entire core of the tool… that isn't the part cutting. Heavily reground tools don't perform as well as new tools. So saying it permanitately affects the tool is also a moot point to the end user.
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How much do you know about material integrity at a molecular level? Can you say with 100% scientific certainty that the edge of the tool doesnt maintain its sharpness better when the stresses are out of the tool? I think you may have to look at the core of why a tool dulls and you can see how cryogenic treatment helps.
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We have had good luck with our Fadals milling mostly soft steel and aluminum up to 5 axis. We are always looking for spare parts
If you have a broken down Fadal give a shout.