CD Matts that improve sound?

The cheapest one is by Herbies audio. costs 17 dollars. I will be getting one for fun.It is available in suitable thickness for DVD and CD players( thin - drawer loading mechanism)

My cdi statmat has been a good investment; would recommend a listen, at the very least.

I have the Aurex. It smoothens and relaxes musical presentation but it is only practical for top loading transports.

Megasam I have the SID.
I have to say I'm not convinced-apparently it will improve DVD pictures too.
I tried that and couldn't see any difference.
Since my eyesight is better than my hearing abilities that was probably enough for me.
And yes I never really heard any difference on audio using the SID in my system (at any stage of it's development).
If someone was to say this and the Statmat which I also tried made very subtle differences then I wouldn't argue too much.
I really do think I can get very confused if the differences are not "obvious".
Buy a couple of CD's instead.