I just purchased a bunch of these here on A'gon, and can say that they make a slight difference in the noise floor. They don't fix major problems and don't effect soundstage etc. but they weren't designed to do that. IMO, it all depends on how well your system is setup. If your cables are all squared away (power cables not touching or crossing interconnects) I think the improvement will be noticable. As a side note, they did make an improvement on my TV, the picture is a bit more crisp, I had some left over and went to my video side to use them. I didn't think it would do anything, but it turns out, they are great for that too! Improvements in 2 areas for a small amount of cash.
