I posted (2) links with reviews on this product- they are both interesting reading, I think that this product is worth looking at. Again I have not tried them but I am going to. The following came from a review at StereoTimes, I think these guys write some very good reviews.
"The Stillpoints ERS cloth is a significant product. Its potential in audio design from loudspeakers to electronics is limited only by the imagination of the designer. My interest is piqued to hear new audio products incorporating the ERS material. Since the most common complaint about the sound of existing systems is harshness and artificial brightness, lowering EMI/RFI's contribution to that complaint is a genuine boon. Congratulations to Stillpoint's Paul Wakeen and Larry Jacoby for bringing such an effective and inexpensive product to market. Thanks guys. Highly recommended."
http://www.stereotimes.com/acc030903a.shtml
"The Stillpoints ERS cloth is a significant product. Its potential in audio design from loudspeakers to electronics is limited only by the imagination of the designer. My interest is piqued to hear new audio products incorporating the ERS material. Since the most common complaint about the sound of existing systems is harshness and artificial brightness, lowering EMI/RFI's contribution to that complaint is a genuine boon. Congratulations to Stillpoint's Paul Wakeen and Larry Jacoby for bringing such an effective and inexpensive product to market. Thanks guys. Highly recommended."
http://www.stereotimes.com/acc030903a.shtml