Though this has come up over and over, while it does seem like it's losing favor, this is still interesting. Though more about knives at the start, he delves into the claims of long term cryo being a thing - or not. I never used it myself because it seemed a bit too much faith-based and light on science, mixed with vendors' strong predisposition toward making money.
NOTE: this is specifically about whether there are measurable benefits from long term cryo treatment. Using cryo as part of the normal (brief) quenching process is a different use and is measurably beneficial.
