I have used the "De Mat" and Herbies CD mat. The De Mat is
heavier and easier to use, but I didn't hear any significant
improvement. You have to rinse Herbies mat with water about
once a week as it tends to collect dust, but with Herbies
mat I definitely heard an improvement. Sound is less digital and more analog like, with tight bass and clean leading edges to the notes. I've used Herbies on a Marantz 67, a Cambridge 500SE, an AH! New Tjoeb 4000 and an upgraded MMF-25. Only the Cambridge would occasionally have trouble reading a disc.
heavier and easier to use, but I didn't hear any significant
improvement. You have to rinse Herbies mat with water about
once a week as it tends to collect dust, but with Herbies
mat I definitely heard an improvement. Sound is less digital and more analog like, with tight bass and clean leading edges to the notes. I've used Herbies on a Marantz 67, a Cambridge 500SE, an AH! New Tjoeb 4000 and an upgraded MMF-25. Only the Cambridge would occasionally have trouble reading a disc.