ive heard from my sempai that the near 0 kelvin makes the molecules compress so much that they in fact re/align themselves and that there is no down side he's heard of.
he says that the supposed realignment is very usefull for cutting blades so they keep the edge longer. my sempai in question is an ex-navy seal, ex-swat, ex-street cop, and a current homicide detective. his extra information on the subject is that military gun barrels have been cryo treated for years now and that it greatly improves harmonics, which are the vibrations on the gun as it is fired. the improved part would be that the virbations are alot more uniform and less random so the acuracy is gerasticly improved.
if ive been mis informed please post so that we may all learn.