What can you say about the SID from Germany?

Tried almost all mats available (still have a SID in a jewel case matter of fact)

The one that works best for me is the De Mat by Van Art Speak, a carbon impregnated rubber mat with a small lip that fits over the CD (not recommended for tray load mechanisms however)

I also attached a Herbies Grungebuster Mat underneath the puck of my CEC top loader for additional damping, a very highly effective combination here.

YMMV