A friend who's opinion I respect, has experimented with both Cryo and demag treatment of his CD's and reports great benefit sonically. He says it improves smoothness and textures while making everything more cohesive.
I have not tried this myself, so I cannot speak from personal experience. If you do this test, please share the results.
I have not tried this myself, so I cannot speak from personal experience. If you do this test, please share the results.