CD Mats -- do they work? Are they dangerous?

No, I haven't tried the carbon one.

123.

I have the Millennium CF and it is worth the price of admission.

I have to agree with Cruz123, I use the Marigo Signiture Refrence with my ARC and yes, it does make a difference, in fact I don't listen to a disc without it. I've had zero problems in use with it, and yes there is not a huge difference but enough of a difference that I'm satisfied that I spent the money for the improvements it provides for me. As with any tweak it is an subjective judgement, if you can get it on a trial basis that would be a way to go for you, also contact your manufacturer and see what tech has to say about it's use as well.

i have the marigo and carbon fiber mat. both reduce focus and have the affect of softening leading edges of transients, slightly reducing apparent resolution in exchange for a somewhat more relaxed presentation.

i prefer the carbon mat to the marigo mat.

Thanks for your responses everyone....guess you have to try for yourself and decide.