I bought the Shine ola. I tried it on 4 CDs and did not hear a difference. I'll continue to experiment with it. The only effective tweak that I have found is a bulk tape eraser. I demagnetize the CDs with it and they sound better. I have been demag'ing my discs for 18 years now. I was very skeptical at the time but decided it to try it one day just for kicks. The improvement was amazing.
