For $75 I chose the Alan Maher Designs Power Enhancer which has similar technology. From what I have been able to gather the difference is the Noise Destroyer uses smaller valued caps, total 2,2uf, while the PE has 3,58uf in mixed values.
I have one of these on every circuit in my home (no dedicated lines unfortunately) and have experienced significant improvement in audio and video. They replaced PS Audio Noise Harvesters in my system. I would suggest you experiment as well with more of the Noise Destroyers. In addition to the audio, you might want to consider putting one on the same outlet as your refrigerator.
I have one of these on every circuit in my home (no dedicated lines unfortunately) and have experienced significant improvement in audio and video. They replaced PS Audio Noise Harvesters in my system. I would suggest you experiment as well with more of the Noise Destroyers. In addition to the audio, you might want to consider putting one on the same outlet as your refrigerator.