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

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.

I had a De Mat once upon a time. I found it did make a difference - and not a subtle one (relatively speaking, of course).

Bass tightened up and seemed to go a tad lower. A better sense of space around individual instruments/ sounds was provided (better delineation of sounds).

I stopped using it, however, when it jammed my CD player with a particular disc.

I used the herbies black hole and then millennium carbon fiber. I never play a cd anymore without the carbon fiber mat, worth the $ Herbies was an improvement, and the carbon fiber another step up

I too have the Marigo signature 3-d mat and have to admit that I could not tell a difference. Just my experience with it.

Regards,
Mike