CD Matts that improve sound?

Any members found CD matt that improves sound without causing any problems? (sticking in CDP etc) I have tried many in the past and none seem to really improve things,
best I have found so far is Marigo Orpheus Crossbow Matt
which does seem to make slight improvement.

I also periodically spray bottom of Crossbow matt with anti static spray to improve effectiveness.

I was curious about Music Direct SID matt they promote heavily, anyone try this and how did it work?