I heard the same thing tbg did - loss of life esp. in upper freqs, a certain "hard to put yer finger on it" a-musicality. Once I felt like I was able to identify the peculiar thing the ers paper did to the sound, I went so far as to place some on the building transformer - outside the building. Again I heard the ers stuff affect the sound (negatively). I was also able to hear the ers stuff hurt the sound by just placing a sheet on the coffee table in the room.
YRMV :-)
Cheers
YRMV :-)
Cheers